Today Google decided to drop support for firefox versions below 4 in Google Docs. In particular, editing presentations with stable-in-gentoo version of Firefox is no longer possible. Please stabilize a modern version of Firefox.
Steps to Reproduce:
1. Go to http://docs.google.com/
3. Upload a powerpoint file
4. Attempt to edit it via the web
Google displays the presentation and the warning that editing presentations is not supported in this browser. The &browserok=true URL parameter doesn't help.
Ability to edit the presentation.
*** This bug has been marked as a duplicate of bug 381245 ***