Off Topic : What is the difference between...

[Rustam]

...the blue and pink icons next to the thread titles?

and gray ones as well, (now that I see them)?

[icesoft]

Pink are threads that have received a certain amount of posts to be deemed 'Hot'.

Blue are new/unread threads that haven't reached the threshold to turn pink

Grey are the same as blue, but you've already read them, or they haven't changed since the last time you were on the board.

[632 Regal]

I don't see that at all.

Firefox blocking it?

[Rustam]

Thanks!