Favicion caching is extremely aggressive in Firefox. In the past, visiting the URL of the favicon and pressing Ctrl+F5 was enough. Nowadays, you have clear your

Favicion caching is extremely aggressive in Firefox. In the past, visiting the URL of the favicon and pressing Ctrl+F5 was enough. Nowadays, you have clear your cache [1] and then restart your browser. [1] Tools -> Options -> Advanced -> Network -> Cached Web Content -> Clear Now