Yahoo will not remember password


New Email
Yahoo Mail (most recent version)
Windows XP
Firefox 5.0

For many months now Yahoo will not remember my password. My account shows that I am signed up to request a password every 2 weeks. It bumps me out even if I leave Yahoo and return a few minutes later. I saw your reply to this question back in 2008 and the answer was to delete the cookies sqlite file in Firefox. Found that file, but I also found a sqlite-shm and a sqlite-wal. Should I delete all of them? I've been trying fix this for months and have not been able to. It's a minor irritation, but it would be nice to have it solved. Thanks for your help.