Firefox not updating
The wiki How Tech Team also followed the article's instructions, and validated that they work. Many problems with Firefox are caused by faulty extensions or themes, incorrect settings, or corrupt files.If Firefox does not work properly (or not at all), don't panic!This is especially helpful in production environments to make sure your users get the update.
Although mozilla are well aware of the issue, as usual, they never fix the annoying small stuff. So, there are two ways of forcing an icon refresh with firefox.I wrote this answer under the impression that this is what it took to refresh favicons in Google Chrome.However, it turns out that this only works for the first five minutes or so, until the icon gets irretrievably lost in Chrome's history synchronization.I looked all around the web, and didn't find a good answer for testing favicons in local development.In current version of chrome (on OSX) if you do the following you will get an instant favicon refresh: This way the Favicon will always refresh when it has been changed.