Logging into Forums

Kawaiiiii - Raging Tide

I can't log into pwi forums on firefox.
This happened like 3 months ago but I was too lazy to post it and I was pretty much quitting
I wanted to browse the forums in peace on my main browser but I had to resort to using
Internet Explorer.
Any fixes on logging into forums?
And yes I have checked th spelling for my username and password numerous times.