I used to experience the same problem with Yahoo! Mail. Once I cleared up my computer using Windows Security Essentials I never had it again.

In regards to problem number four. You can look at your saved passwords. Go to your options (Not sure how you have yours set up you can either go Tools>Options or you can go Orange Firefox Tab>Options>Options). Click Security then saved passwords.

One problem is that I am all ready using Kasperski Internet security 2011, and recently ran a full scan, all drives and it was clean, so no virus, etc issues. Running two anti-virus programs at the same time (Microsoft and Kasperski) is not a good idea. They can tend to fight each other etc.

I do thank you for your answer, I did find my passwords.

I have the FF 4 and now FF 5 crash while using Yahoo! Mail problem. I'm running Fedora 15 64 bit with FF 5 and Fedora 14 64 bit with FF 4. Very consistent. Seems to require some time (hours) between crashes, but usually crashes while deleting an email.

I could not get support from any one (Yahoo!, Fedora, nor Mozilla) so I switched to Chrome 64 bit for Linux. No problems for DAYS since I've switched. Something Y!M is doing is crashing FF several times a day. No web page should be able to crash the browser.

Y!M was not very sympathetic when I contacted their support. I'm a paying customer after all. They told me they don't support Linux and I should "upgrade" to Windblows... Not a chance that is going to happen.

I have HUNDREDS of crash reports sent to Mozilla and with my email address and no one has contacted me about this.