I CAN NOT LOGIN INTO MY FACEBOOK ACCOUNT- PASSWORD AND EMAIL ARE CORRECT AND WHNE I GO TO LOGIN ONLY GET A BLANK PAGE WHY WHY WHY
First you should immediately update to Firefox 15.0.1, the version you are running is extremely old and out of date. Update Firefox to the latest version
AFTER doing the update, try to Reset Firefox, Refresh Firefox - reset add-ons and settings
This can be caused by corrupted cookies or cookies that aren't send or otherwise blocked.
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
"Remove Cookies" from sites causing problems: