I'm guessing this is why the page re-directs to the forum instead of the original homepage now (?)

got something weird happening too
every time I try to visit either webiste or forum with mozilla it gives me a blank pagebut in IE it works fine

^ Just tried it and works fine for me. Not sure what to advise.

I use firefox as well and works fine here as well.
Try reinstalling it maybe?

did you try to delete cookies? I remember I had a similar problem with firefox about a year ago