Comment 18 for bug 397211

NoBugs, you can change the value permanently by making the change I originally suggested:

1) Type 'about:config' into the address bar of a new tab
2) Say you 'are sure' or whatever it asks you if it does
3) Type 'general.useragent.extra.firefox' into the search bar on the page
4) Double click "Shiretoko/3.5" and a modal dialogue appears where you can change it to "Firefox/3.5"
5) Close the 'about:config' tab and you don't have to worry about it anymore :)

Funny thing is Ubuntu is supposed to be very easy for an 'average human being' to use but average human beings don't know to do this and don't know why their 'new and improved' browser is unsupported by many of their regularly visited websites :(