Selenium is a web testing framework that allows you to test web applications involving HTML and Javascript. The plugin hasn’t been updated to indicate that it works with Firefox 4, so you can’t install it directly.

You can use the Firefox Add-on Compatibility Reporter to install Selenium and other Mozilla Firefox plugins that have not yet been marked as compatible. After you install the compatibility reporter and restart your browser, you should be able to install the official version of the Selenium plugin.

Props to the Mozilla support forum for the tip!

2011-04-01 Fri 12:21