Sometimes clearing the cookies / temporary internet files is not enough with Mozilla Firefox.
Firefox is a great browser, but can get confused from time to time. If you've noticed that it is not keeping you logged in and you have cleared your cookies and other private data, you need to force Firefox to rebuild its cookie database.
Open My Computer
Go to your C Drive (or whatever drive windows is on)
Go to Documents and Settings
Double click the user name you log in as (Some PC's may just have 1 folder here)
Go to Application Data
Go to Mozilla
Go to Firefox
Go to Profiles
Double-Click the folder in the profiles... it will have a strange name.. always does.
Delete cookies.sqlite
Now Close Firefox, and open it back up.. The downfall to this is that you will have to log back in to all sites you currently had firefox keeping you logged into.. You will NOT, however, have to rebuild your passwords.. Firefox will remember all saved passwords you had entered before this.
Hope this helps solve the issues with Firefox that some are having.
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“If ye love wealth greater than liberty, the tranquility of servitude better than the animating contest for freedom, go home and leave us in peace. We seek not your council nor your arms. Crouch down and lick the hand that feeds you, and may posterity forget that ye were our countrymen.” - Samuel Adams