Can’t login using Firefox

I am able to login using internet explorer but it keeps on telling me successfully logged in then it says I have to register again when I use Firefox. This just started recently. Can one of the Mods please help me out with this issue. Thanks in advance.
Answer #1
https://www..org/viewtopic.php?t=15900733
Answer #2
We Can’t help you…But you can help yourself…Tools > Clear private data..
That should do it..