this can be caused by corrupted cookies.
"Clear the Cache":
- Firefox > Preferences > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
- Firefox > Preferences > Privacy > Cookies: "Show Cookies"
If clearing the cookies doesn't help then it is possible that the file
cookies.sqlite that stores the cookies is corrupted. Rename (or delete)
cookies.sqlite (cookies.sqlite.old) and delete other present cookie files like
cookies.sqlite-journal in the Firefox Profile Folder in case the file cookies.sqlite got corrupted.
Hope that doesn't sound too confusing!!! Before you do that, try going though Internet Explorer and see if you can log on that way. That way you will know if its just firefox or another problem, if so than do what I wrote above!! Hope this helps you!! (*_*)
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