Which browsers are officially supported by Stack Exchange?
Also, what else is needed in order to use every feature of the site?
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We support the last two stable versions of the browsers that we see the vast majority of our visitors actually use. This does not include beta/dev releases, which are not supported.
The supported browsers, in practice, based on the above guideline:
If your browser isn’t in this list, it still may work, but with a degraded experience. Less common browsers people have tried:
Avast Secure Browser
Internet Explorer Mobile
Microsoft Edge Mobile
Firefox for Mobile
Chrome for iOS
There are requirements beyond using a modern browser for getting the best possible experience:
Cookies must be enabled.
Images must not be blocked. (Since CSS Sprites are widely used.)
The following sites should be accessible:
stackauth.com for Global Network Auto-Login. This feature uses HTTPS, so your browser must accept its SSL certificate. It also requires a browser that supports HTML5 Local Storage, such as Internet Explorer 8+, Chrome, Safari, Firefox 3.6+ or Opera 10.61+, and you'll need to accept some third-party cookies. See also the automated tests on Network Login Troubleshooting, and notes about allowing third-party cookies in, for example, Chrome. And beware that plugins such as ad blockers might interfere.
qa.sockets.stackexchange.com for live updates on your Inbox, reputation, new questions, answers and more. This also needs both your browser and your network/security to support web sockets. See websocketstest.com to test that.