I have a website that I've just uploaded onto the Internet. When I browse to the site using Firefox 3.0.1 on Ubuntu I don't see the favicon; Firefox 3.0.1 on WinXP does display it.
Why isn't the favicon displaying under Ubuntu? It's a favicon.ico file in the root directory, not referenced in the meta tags; would it work better as a GIF?
Previously, there was no favicon. The browser cached the lack of favicon. Clear the Firefox cache, and all is well.
GateKiller
Try taking a look at this previous Question, which shows you must put two meta tags in your html in order for it to work across all browsers and operating systems.
来源：https://stackoverflow.com/questions/6732/why-doesnt-my-favicon-display-for-my-web-site