Throughout this year, we have put lots of focus into making web browsing with Opera super fast, with unique features such as native ad blocker and faster startup time. With Opera 43 beta we are doing another speed boost that will accelerate your browsing: instant page loading and PGO.

Instant page loading

Instant page loading is a mechanism where the Opera browser tries to predict which website you are typing the address for and starts loading it in the background even before you hit enter.

opera_prerenderer2

Instant page loading gets smarter over time and learns from all previous address bar inputs which led to loading a specific web site. So if you start typing “nyt.com” every time, it will eventually learn that and load New York Times in the background. In addition, when you search for something, it will load the results likely to be clicked in the background.

Opera can predict what page a user is going to load not only from its behaviour, but also when the current page uses the < link rel=prerender … > tag. For instance, Google uses that for search results if they are pretty sure of what you will load next.

PGO for Windows

Another feature that improves Opera’s performance is Profile Guided Optimizations (PGO). PGO is a Visual Studio compiler feature, able to make software running on Windows significantly faster.

There is a trade-off between the size and the speed of the browser. If we tried to maximize the speed of everything, our browser would be a 1GB download, and as a result it would consume a lot of memory and become slow instead. With the help of PGO, Opera can run compiled data faster. By selecting a number of important scenarios, we can now teach the compiler what code is important and what is not, and optimize the important parts in a much more effective way.

PGO brings several improvements by optimizing the most important parts of the browser.
With this technology, startup is 13% faster* and the loading time improvement is confirmed by several benchmarks, such as Speedometer (5% faster with PGO), or Sunspider, the JavaScript benchmark (2.4% faster).

Classic link selection

Another feature you will find in Opera 43 is a classic link selection, which some of you might remember from Opera 12. With this feature, Opera is able select text in the link without a hyperlink. Using classic link selection is very simple:

horizontal mouse movements: select text
vertical mouse movements: drag link

*The results are from a computer running Windows 7 x64 using an i7-6700 CPU locked at 3.4 GHz. In the startup tests Opera was stored on an SSD. We’ve compared x64 build number 43.0.2440.0 compiled with and without PGO.

Full changelog.

Installation links:

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  • L33t4opera

    Hi Grzegorz, thanks for the article, and congrats on the first Opera beta 43 😉

    • http://wiidatabase.de/ iCON

      Weather widget? Interesting. The option shows up, when the flag is enabled, but the widget itself doesn’t show up.

      • L33t4opera

        Hello, sorry for the late reply, it seems that this feature is still under development, and we will have to wait a bit longer, before it will be fully implemented.

  • Matheus Bombonato

    These changes will not be applied to the developer stream?
    The page redrawing bug is driving me crazy!

    • http://www.opera.com/ Grzegorz Miazga

      What’s on Beta is already on developer (not the current one as it’s older version, but next public will have all of it). What page redrawing bug? Could you give us some example/screenshots?

      • Matheus Bombonato
      • Matheus Bombonato

        BTW 44.0.2444.0 (PGO) still bugged

        • http://www.opera.com/ Grzegorz Miazga

          This issue is supposed to be fixed by “DNA-58322: Newly opened start page sometimes has wrong size”. Which is both in Beta and 44.0.2444.0. We used following reproduction steps:
          1. Open two windows
          2. Make second window much smaller than the first
          3. Switch to first window and open new tab
          Perhaps there is still some other case when it’s not solved. Could you give us exact steps you do when this bug occurs? Does it reproduce if you have clean profile?

          • Matheus Bombonato

            That’s the problem. It happens randomly. Did my best here to give you a step by step. Hints: I’ve never use more than 1 window. My issues may be related with the use of Developer Tools on the right side.

  • DMCA

    fast….

  • mikemanger

    I’m a bit confused over this bit about the instant page loading thing:

    “[…] but also when the current page uses the tag. For instance, Google uses that for search results if they are pretty sure of what you will load next.”

    Could someone clarify how this is done (what is the ‘tag’)? Thanks

  • Кostadin

    So, optimizations in the 44 build are integrated in this beta?

  • verter

    How about fixing basics first like DNA-53282? It will bring you much more new users.

    • BK

      The good news is that we know how to fix it. The bad news is that it’s stuck in bugfixing queue.

      • verter

        How long?

  • Vikruntasas

    When will you patch the Opera VPN memory leak?

    It’s a pretty huge bug if you ask me. Impossible to browse picture galleries with VPN on without running out of memory in an hour.

    • Daniel Bratell

      (My information is a bit old here so it’s possible there has been more work on it)
      It will be patched as soon as we figure out what is the cause but unfortunately it seems to not happen in a lab environment so we need to figure out what it is that causes the increased memory usage. It seems rather rare which makes it harder to debug.

      • Vikruntasas

        Thanks for your reply! 🙂

        • http://www.opera.com/ Grzegorz Miazga

          Hey, could you provide us with more details regarding your environment and reproduction steps?

          We are interested in:
          – Hardware details.
          – Operating system.
          – Site you are visiting.
          – Does it reproduce for you on any Opera stream (dev, beta, stable)

          • Vikruntasas

            Somehow, when I reinstalled Windows 7 64bit completely anew and installed Opera 43 beta 64bit – it fixed itself (even though I used the old Profile folder.

  • Nekomajin43

    Is the HTML export left on the developer stream, or it works, but I don’t find it?

  • nme

    Maybe implementing that same ‘instant page loading’ on speeddial’s item mouse hover? People usually hover over item for a second or two before pressing it.

    • Ari

      So if you hover over 5 items before getting to the one you are trying to reach it will be loading 6 pages at a time? It would be probably slower than waiting for the user to click the needed one

      • nme

        Well, you can only use the one process to load a single page in background and set a hover time offset (say 100-200ms, ofc that would slow down target page loading by the same amount, but that time will be used to kill previous load process anyways) – most people usually just left click on the sd item thus no need to load every site you hover on. For us with a lot of items – middle-clicking on a bunch of ’em in 1 sec – there’s no help .:)

        • Ari

          LOL that’s true 🙂

        • filbo

          Actually, middle-clicking on 50 things is an area where Opera could make things *LOADS* faster.

          It’s simple: as soon as you notice the “middle click a bunch of stuff” pattern, STOP CREATING PROCESSES FOR THEM AT ALL. Just open tabs in a totally dead, quiescent state. No thundering herd of gigantic processes!

          Activate each one if and only if the user displays that tab. Similar to the situation when you’ve just restarted Opera with a bunch of tabs (and you have the right settings, which have obnoxiously changed from time to time).

          General hint: when I have 80 tabs, I really don’t want processes for each one. Most of them should just be a “ghost” tab, waiting to be activated. I’d really like a setting for: “When a tab is opened in background, NEVER start loading it.” I’m 100x more sensitive to memory hogging than network speed once I actually focus on a tab.

          • nme

            So, something like a placeholder tabs. 🙂 Functionality is already there (lazy-loading tabs) so they could (probably) easliy work something like that in. I probably wouldn’t use it often, but I agree that something like a ‘Open link in a lazy tab’ should be available for advanced users. +1 mate

      • Daniel Bratell

        (I have not written the code so this is hearsay but… ) For pre-anything (name lookup, connection, rendering) I think you have to halt the mouse over the link. And there will only ever be one prerender at a time. Not sure which one in this scenario.

    • Daniel Bratell

      I can not confirm, nor deny that such ideas are being tested!

      • nme

        😉

  • iYuzver

    Again there is not really important innovations. I am disappointed. Already three versions in a row.

    • http://www.youtube.com/user/max1cp?feature=mhum Maxim

      Can you give an example of what an important innovation would be for you?

      • iYuzver

        Synchronization Extensions.
        Native translate in Chrome.
        Recently closed tabs 50+.
        Disable display open tabs.
        Display columns bookmarks: http://funkyimg.com/i/2mina.jpg
        Need a South Korea, China and Japan VPN!
        Management of downloading from a context menu: http://funkyimg.com/i/2jpGc.jpg

        • Ari

          Ohhh really innovative man. I hope they hire you

        • http://www.youtube.com/user/max1cp?feature=mhum Maxim

          You understand that a lot of these things take time to develop right? I’m sure they are working on a lot of the things you have listed. The things that have been introduced in this beta have been in the works for months now.

          • Nekomajin43

            The ones connecting to the tabs menu are minor modifications. And those should have been done when they released that feature.

          • iYuzver

            I can see that Opera is simply losing the audience. For many months, they do not do anything sensible. Opera – a company with a large staff. I listed features able to realize a one chinese programmer. And such practical examples are, but I won’t call them not to advertizes. Therefore, everything that makes the Opera – this is only the policy of the company, rather than the inability to implement the functionality. Opera still has an audience only through the old Opera Presto. Compared with modern browsers it is largely uncompetitive. The Chinese have long jump on it. I want to see the Opera browser a good and strong, but as such it is difficult to call, and for the past three versions introduced a nonsense, and not really worth functions. I think they spend a lot of time not on what is really important, but the time they do not have such a thing. Looking at the senseless upgrade Opera I myself went to the Chinese browser, because they are simply better. While Opera is competitive will not I will not go back on it.

        • mori bund

          I add Tab Stacking to your list. ^^

  • Falconet

    Linux Mint x64
    Currently using the latest stable but his has happened since the previous version.
    If I select some text, a box with “search/copy” shows. If I scroll-down or up with that selected text, the box won’t go away but rather more boxes show up.
    Then Opera crashes and restarts saying it recovered from the error and offering the option of “do not show this again”.

    Here is a pic. https://drive.google.com/open?id=0B496l34gHIjlQjM1M04wcGRmU2s

  • deus-ex

    “Opera 43 beta, faster, faster, faster”. Thank you, Team Opera, you just made browsing fun again! The experience compared to the previous release feels awesome. I’m looking forward to the next developer release.

  • Shion

    Opera – we are going to load up all internets just to show you 0:01 timer on comparsion charts. And screw the fact that it might generate unnecessary traffic and could be used in hacking activities that user won’t even notice. Screw that some servers can barely give out stuff at 100kbps. And most important of them all – screw the users consent to open a page, that is the press of ENTER key. Because FASTER, FASTER, FASTER!!!

    Do not want. Would prefer for the renderer to actually work faster instead of just starting earlier.

    • Ari

      Disable it and stop crying. For regular people who are not freaked out about everything they will feel it snappier.

  • Ghirahim

    Developer when?

    • http://www.opera.com/ Grzegorz Miazga

      We don’t plan to do any more releases this year.

  • Nekomajin43

    @gmiazga:disqus The video popup button is visible in fullscreen mode on http://rtl.hu/most/ .

    • http://www.opera.com/ Grzegorz Miazga

      Any way to view those videos without registering? translate.google.com doesn’t make signing in easy so could check that out tomorrow.

      • http://www.youtube.com/user/max1cp?feature=mhum Maxim

        I’m not sure if this is specific to that website or not. I have had this bug pop-up every now and then on random sites even youtube.

      • Nekomajin43

        Sorry, I forgot to add. You have to register.

  • Ari

    I have tried it with a few pages and I’m not seeing any network activity before pressing Enter. I’m doing exactly the same as the gif on the post. I have already checked that both prerender flags are enabled. Anybody else have tried it with technical proofs?

    • http://www.opera.com/ Grzegorz Miazga

      It will only start working for pages you often visit. You can see if browser can predict your visits by viewing opera://predictors. If any entry will be green it means predictor should be used on next visit.

      • Ari

        Wow great statistics page. I’m seeing all of the pages I have tried are in green. Still no network activity 🙁

        • http://www.opera.com/ Grzegorz Miazga

          In such case you can check if prerenderer actually activates on opera://net-internals/#prerender
          Got to keep in mind that prerendering is very cautious as to not use your bandwidth and memory unnecessary. So if in any doubt it will not be used.

          • Ari

            Wow another awesome tool. I have uBlock which disables “regular prerender” and it’s stated in there, but omnibox prerender is enabled. Despite that on every row from the table I have Prerendering Disabled with Omnibox as origin… I will restart browser later but it’s weird that’s is not working on even a single page.

            PS. I have tried disabling uBlock so that I can enable the regular prerender but still didn’t work.

          • Ari

            PS2. Ok, I have figured it out. I re-tried disabling uBlock and enabling the regular prerender (prerender network actions option on Settings) (I don’t know why this option is mandatory for Omnibox to work) and it started working. I’m figuring out now that this way, the bandwith that was saved by ads being blocked it can’t be saved anymore since whole page is loaded in the background.

            Is your own ad-blocker integrated with prerendering?

          • http://www.opera.com/ Grzegorz Miazga

            Great question! Will forward this to developers.

          • Arjan van Leeuwen

            Yes, our own ad-blocker is integrated with prerendering. uBlock disables it explicitly: https://github.com/gorhill/uBlock/wiki/About-the-required-permissions

          • Ari

            Thank you very much for the info. I’m seeing that uBlock still blocks content if I enable the prefetcher but I’m pretty sure it’s missing some requests to block so I will start using yours and add lists to it.

            One more thing, if Opera Turbo is enabled, prerendered pages will pass through your compression servers too right? Except https?

            Thanks again.

          • http://www.opera.com/ Grzegorz Miazga

            Yes, prerenderer should use both Turbo and VPN when they are enabled.

          • Ari

            PS3. Now that I’m revolving around these settings I don’t get the difference between omnibox prerender and the one that is enabled by that tick box on settings. Aren’t they the same?

          • http://www.opera.com/ Grzegorz Miazga

            “Use a prediction service to help complete searches and URLs typed in the address bar” – this is about displaying search suggestions in address bar dropdown.
            “Predict network actions to improve page load performance” – is about prerenderer, prefetch and other features which actually improve page loading time.

  • iG0Lka

    Whether you can do it – you highlight the text is a link (which Opera does not recognize as a link), and clicking on it the wheel to open it in a background tab?
    Now, to open the link in a text (which Opera does not recognize as a link), you need to select the text is a link, then open the context menu by pressing the right mouse button. Then, hold down the Ctrl key and select “Go to web address”
    example: https://habrastorage.org/files/cea/1db/f59/cea1dbf595334581a11e9e74278800c7.jpg
    try it yourself:
    http://eu.battle.net/forums/en/overwatch/topic/17614454967#post-8

  • Erhan Yavuz

    Ağız yarası birçok hastalığa ve patolojiye bağlı olarak ortaya çıkan, sarı ve kahverengi görünümlü ülsere veya eroze lezyonlara verilen isimdir. Bu yaralar ağız içinde olduklarında oral aft ismini alırlar.
    ğız yarası oluşumunu tetikleyen birçok hastalık ve durum olduğu düşünülmektedir.Bunları sırasıyla inceleyecek olursak :
    Ağız Yarası Neden Olur

    En Sık Nedenlerden Birisi : Yiyecekler

    Yiyeceklerden etkilenen insanlar genelde hassas cilt ve mukozaya sahiptirler. Aşırı asidik ve aşırı bazik yiyecek ve içecekler bu hassas ciltlerde dejenerasyona yol açarlar.

  • Ralf Brinkmann

    This version unfortunately has the same problem as the new developer 44.2440.0:
    When you close Opera and restart it, all previously switched off plugins are enabled again.
    https://disqus.com/home/discussion/operablogdesktop/private_opera_developer_43024400_with_pgo/#comment-3058955236

    • Kornelia

      Thanks Ralf, I’m forwarding this issue.

      • Ralf Brinkmann

        Thank you Kornelia. I wish you happy holidays!

      • shounen

        give us backup and restore feature for opera DX you can simply create software that will backup the browser into dedicated file and will be able to restore it 1:1 on the other device [because your synch sucks]

  • Nekomajin43

    Two feature requests for the search popup:

    1) If we highlight a valid URL, which is not linkified, show “Open” instead of “Search”.

    2) If we highlight a shortened URL, try to resolve it, and show the actual URL in the popup.

  • Regnas

    Coll stuff….
    But hopefully the “Instant page loading” feature will be optional.
    Thx…

    P.S. I didn’t installed this yet, so I don’t know if it’s already an option or not… 🙂

    • Leonardo Gomes

      You can avoid it by disabling ‘Predict network actions to improve page load performance’ in settings.

      • Regnas

        Are you sure they linked this new feature to this old setting?

        • Leonardo Gomes

          It was commented here somewhere.

          • Ari

            Yes, I commented it below. That option must be enabled for omnibox to work.

          • Regnas

            Good to know.. Cheers..

          • Regnas

            Ok, thx….

  • https://vivaldi.net/unity/profile/chas4/6-blog Chas4

    Had a crash to update the beta

    macOS 10.12.2 (Opera beta sent the 2 crash reports)

    • Kornelia

      Thanks, we will try to find those reports. Did you manage to update it after that?

      • https://vivaldi.net/unity/profile/chas4/6-blog Chas4

        It crashed to update, after the crash it was updated, and then crashed again

  • sgrandin

    I’ll raise this again: For some reason, the Speed Dial thumbnail choices using the heart button won’t show the top of the site’s page as a choice. That’s where the site title is and this bug seems to be at every site, as far as I’ve seen.

  • penahj

    Chromecast – the native implementation is a great addition! For some reason, my old first generation chromecast is not being found.

  • gluidori4e

    my heart belongs to opera 12.17

    • shounen

      forgive, but there’s nothing to make me stay with that cr**p imo it’s even worse than newest opera’s

      • Ari

        So why are you on this blog at all?

  • sgrandin

    After I update Opera beta, it opens with the larger text, hence not invoking my –alt-high-dpi-setting=96 command, although it’s still there in the registry (this is not affecting my desktop icon). Is there a place to correct this, or is it in the nature of how Opera installs?

  • Ari

    I think I’m seeing a leak here.

    My opera opens in new page tab like this:
    https://ibin.co/36PDTmK9386y.jpg

    First strange thing I notice is that I have 2 processes for start page. So then, I go to let’s say Opera blog:
    https://ibin.co/36PDe57d1Vrk.jpg

    You can see that there is a process still opened for speed dial, so I end that process and open a new tab to see how many processes it opens:
    https://ibin.co/36PDgZyxRVFH.jpg

    Same as the beginning, 2 processes. Probably those 2 are normal but if I go to a site again on that new tab then the speed dial process is still running again, and I don’t think that’s normal.

  • Kevinar

    Hi,
    I have problem with displaying some pages

    https://app.box.com/s/x6gjjottqwh4meiq4fcux97s7bjj1slg
    https://app.box.com/s/0ryhyovy7yxo81dospavqjziwt0kogee

    and problem with Google login on the main page

    https://app.box.com/s/p6x2xw1mgs7ihppvmzwq5t9gasdvhq4k

    for example on the gmail, youtube it is everything ok

    https://app.box.com/s/yhzvik0dezxquv46o72n9e2gtl92k2z7

  • Dart

    I have a problem with YouTube. About two weeks ago, YouTube has ceased to remember the time that I finished watching the video. I found out that the problem disappears when add YouTube in a white list adbloсk.

    • Leonardo Gomes

      It’s a list issue, the same happens if you use Ublock Origin.

  • Corzo

    I not tried the last developer, so I had a doubt in this beta, the black background when you open a image it’s gonna be definitive or there’s a flag or setting to disable it at least in this cycle, because it breaks the Viewhance extension and it’s only for chrome.
    When the change to center the image was made didn’t affect the functionality, but in this case it does.

  • sgrandin

    It’d be nice if users could set the number of items showing in recently closed, at least up to 20 or 25, instead of having to resort to history beyond 10.

  • Andrey

    How i do remove ‘unsorted bookmarks’ folder & rename ‘my folders’ to ‘my bookmarks’?

    • Leonardo Gomes

      A new clean installation may do the trick.

      • Andrey

        Without reinstall or delete profile or reset synchronisation please.

        • Leonardo Gomes

          There is no way AFAIK. The change seems to happen only for new installations.

          • Andrey

            When remove file ‘Local State’ – settings & flags are reset, but unsorted bookmarks are deleted.

          • Leonardo Gomes

            Because this makes Opera thinks that there is a new installation/profile.

  • sgrandin

    It used to be that highlighting the URL showed the whole address. Is that no more? With this build, I’ve had a couple of times when I copied the URL into Bookmark Buddy and the link wouldn’t work, because it lacked an http://. I’d prefer show all on highlight vs. having to show it all the time (settings).

  • Algy

    Since Opera 42 HTML5 videos no longer play for me on many sites including BBC (which says I have it selected). I just downloaded Opera 43, used it without any modifications, and had the same problem. The videos play ok an Firefox. Is there a solution please?

    • Ralf Brinkmann

      I have tried out some videos on http://www.bbc.com/news/video_and_audio/headlines/38458255, they all play. Did you mean this BBC? Videos on other pages also play, except it is flash and there is a wrong browser detection and switch.
      W10x64
      Operax64

      • Algy

        Thank you Ralf. Your link is not working on Opera (it works ok on Firefox and Chromium). I get a brief message about Flash not being installed I think, as it’s very quickly replaced by a message saying “This content doesn’t seem to be working.” with a Try again button.
        I should have said I’m using Ubuntu Mate 64, sorry.

  • sgrandin

    I’ve now had several times with this build that the Speed Dial has out of the blue changed from six columns to five (or I think four). Never with any build before this. Each time, it’s been well into a long computer session. Closing and reopening Opera has restored it.

    Update next evening: just happened again. Left computer, which had been running all day, for a couple of hours, came back and SD was now five across instead of six. Obviously, I can’t say for sure what’s causing it, but as I noted it’s never happened with a previous build. That makes this Opera beta the first place to wonder about.

  • http://biblemegasite.com David1970

    There is a problem with the back/forward cache between two sites that have a different zoom level.

    For example, the site I created, http://biblemegasite.com/outline-leb.html has a 100% zoom level, while biblegateway.com has a 200% zoom level. My bible outline links to biblegateway.com. I click on an outline link on my site, and it goes to the Bible Gateway with the correct 200% zoom. When I click the back button to my site, it zooms my site to 200%, even though Opera says it is 100%.

    When I fix the zoom of my site to 100%, I click an outline link, and Bible Gateway shrinks from 200% to 100%, and the print is too tiny for me to read. I can’t use my site with Opera beta!

    I have tried everything, and I’m not using any extensions. However, Opera Stable does not have this problem.

    If this problem migrates from Beta to Stable, I will be forced to find another browser because I can’t use my site the way Opera Beta is now.

    • filbo

      I reported that as DNAWIZ-9927 on 2016-12-14 (“Summary: wrong zoom persistence when open different host / same domain”). Your experience is slightly different in that you are switching domains, but otherwise the same.

  • yigido

    Please check this user interface bug : DNAWIZ-10487
    I will add screenshots too for this bug
    Thanks

    • Leonardo Gomes

      And the bug is….?

      Mentioning a bug id here without saying what the bug is doesn’t make much sense since the idea of commenting about bugs here is to let people know about them and even discuss about them.

      • yigido

        Sorry.. Please watch the video: http://g.recordit.co/XkttV09owj.gif
        I tried to explain it here.

        • Leonardo Gomes

          Doesn’t seem to be happening here on Win10.

          You just need to open Opera for the white line to show up or there is something else to be done?

          • yigido

            Just open the Opera and the white line appears. I resize the UI as shown in the video. It got fixed.
            I closed Opera and open again. The white line comes again. I repeated it many times.

        • Ralf Brinkmann

          Forbidden. Code: AccessDenied. Message: Access Denied

  • Ralf Brinkmann

    Can not insert an “f” when editing speed dials.

    Today I wanted to edit one of my speed dials. I could do anything I wanted except inserting (or adding) the letter “f”. When I press it, the cursor disappears. Copying it anywhere else and then inserting with CTRL-V works, but not typing directly. What’s that? Anybody else?
    W10x64
    Operax64

  • motyus

    Thanks for the update, keep the great work Opera 🙂

    By the way the chromecast feature is not working since for a while since Opera updated to new Chromecast native engine. I’m using chromecast generation 1. It is working for me for Chrome browser and my Android mobile phone.

  • F Scan

    Waiting for the update.

    BTW. Are there any plans to add setting for changing the Search Engine on Speed Dial? For now it is set up during browser installation and based on PC geolocation. But if you use to search with another search engine there is no way to change it for unexperienced user.

  • http://www.lordbeariofbow.com Brian Smith

    I’ve been using Opera for years but will give it away. It has decided that it will not allow everything I’ve been doing without trouble for years, now all I get is “Invalid certificate” . Why all of a sudden have the things I’ve been doing for christ knows how longsuddenly become unacceptable> They wont even let me open photographs in my mail. So stuff you opera!

  • L33t4opera

    New build – Opera beta 43.0.2442.21 😉
    The change log, and the announcement.

  • Денис Дмитриев

    Hi,
    using Opera Beta on Mac. Currently I had the latest version installed 43.0.2442.21.
    I am sticking to Beta channel for ages and updating from version to version since forever.

    For the last 2 or 3 (can’t remember exactly 🙁 ) updates I started to see nasty UI bug which forces me to re-start Opera several times a day. Problem is after some time gray empty space appears at the left. See screenshot
    http://i6.imageban.ru/out/2017/01/17/7c8ce615058a18a9bfd66c005b13ec8e.png

    When this happens, same stripe appears for every tab in a window. If I create new window, there will be no glitch there, at least initially.

    Also, when it happens, full screen videos appear with empty space at the left AND at the top, like this http://i2.imageban.ru/out/2017/01/17/6a25244dae841a43edd29eed8018a5b6.png