I have been effected by the evil firefox bug which causes tab and enter to stop working. As of this writing there is no fix for this.
Here is what i have found out about living with this bug and other info:
1. shift-enter works instead of enter. No replacement for tab exists.
2. opening a new windows or restarting firefox fixes this problem for a while
- people suggested using session fix addon to remember your tabs while you restart firefox
1. people claim its a firebug issue or a web developer issue. i have both of those installed, by the way
2. there is a firefox bug report on this here
3. some posts on message boards which might eventually find a fix for this problem are:
at this point the best solution seems to use that session fix plugin, or maybe do a reinstall.