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Security & Privacy on a Shared Computer
Are you sharing your computer with colleagues, family, or co-habitants? Do you surf with Opera on publically accessible computers? This page holds some tips for maintaining privacy within the same computer and user account.
Shared Computer
First of all, when installing Opera on a multi-user Windows computer, make sure to opt for separate user directories during install. This will ensure that your settings, e-mail, Wand passwords, history, and so forth, are stored in your own user directory only. Remember that this may be of little use if other users have administrator privileges on the same machine, unless you protect your files by other means.
Shared Account
If the same user account is being used by several people, for example on a library, there are other precautions to take that will help guard your privacy.
When using Opera on a shared user account, the following features may raise privacy concerns, and you should consider whether you want to disable them, avoid them, or use them with caution:
- E-mail, Usenet news, newsfeeds, and chat ( and to disable)
- The Wand ( to disable or set master password, and to manage stored passwords)
- Auto-completion of forms ( should be kept empty or used for generic, non-sensitive information only)
- Saved sessions and "Continue from last time" (use to set Opera to start with your home page and disable the start-up dialog)
- User JavaScript (use to clear the "My JavaScript files" field). Note that User JavaScript is not loaded on secure pages.
History and Cache
All browsers keep records of where you have been on the Internet, and even store Web pages and other files (such as graphics) in a local folder known as the cache. Your cache folder can thus contain sensitive information. If you do not want other users to know about certain sites that you have visited, your history may point them to these sites, and your cache may contain local copies of the content of those sites.
If you do not want Opera to store your history, go to and set the number of both typed-in and visited addresses to be stored, to 0. You may also set the cache to "Empty on exit", which means that it will be cleared when Opera is closed.
Cookies
Note that cookies are often used to simplify logins, remember personal information in Web forums and so forth. Such cookies should not be passed on to the next user. The easiest means of avoiding this, is to clear all cookies before closing Opera. This, too, can be automated. Go to and opt to clear all new cookies on exit.
Tracing password-protected pages
After you log on to a password-protected site, your browser will store the pages you have visited in your local cache where other people may find them. Enabling makes Opera tag the cookies of the documents that were viewed after you logged in and automatically delete them from the cache when you close the browser. The Web addresses of these pages will never appear in your global history, and they will be removed from your list of typed-in addresses. Note that this option does not remove the cookies themselves.
Delete private data
Whether or not you have automated these processes, you can use at any time to clear the history, cache, and cookies. You may also want to empty the list of transferred files if you have downloaded any files that did not open directly in the browser.