I downloaded Firefox 3.5 last week and while I did notice a slight performance improvement, there are a few unexpected updates as well:
- Photos look much darker in 3.5 since it uses the embedded ICC profile where other versions/browsers don’t. Whether or not you think this the more correct method of displaying images, its a bug and has been acknowledged as such (https://bugzilla.mozilla.org/show_bug.cgi?id=488800).
- Firefox 3.5 compatible version of Firebug is nearly useless. Though, it is only in Beta and appears to be getting almost daily updates.