2 issues: Alt tooltip shows blank, browser hangs intermittently

I have tried multiple things - as I seem to have several issues with firefox.

Here is the list, any help you could give would be appreciated:
- When I mouse over images, the tooltip displays either blank or the tag for something that I looked at several pages ago.
- After I browse for a while, firefox starts to hang intermittently (for a couple seconds at a time, but enough to be an issue)
- When I bookmark, I used to be asked what location I would like to put my bookmark (i.e. folder, bookmark toolbar), but now I don't.

I have done a clean install, erased my profiles as well - and none of these seem to resolve the issues.

Can anyone help me please? Thanks in advance!