Firefox Extended Support Release
We do our best to support Firefox's latest Extended Support Release (ESR). Some features on GitHub may be disabled in older versions and require the latest version of Firefox.
Internet Explorer on Windows XP
Because Windows XP is not supported, you'll receive an error when you try to load GitHub in Internet Explorer. For more information, see "Improving GitHub's SSL setup" on the GitHub Blog.
Internet Explorer Outdated Browser Error
We only support IE running in "Standards Mode." If you see an error message saying your browser is outdated, turn off "Compatibility View".
Beta and developer builds
You may occasionally encounter unexpected bugs in beta and developer builds of our supported browsers. If you encounter a bug on GitHub.com in one of these unreleased builds, please verify that it also exists in the stable version of the same browser. If the bug appears to only exist in the unstable version, you might consider reporting it to the browser developer.