"red" new replies folder icons
 

This problem began as soon as I switched to FireFox, so I know it probably isn't the board's fault, but this seems like the best place to post this.

When I go to my posts, the threads that have unread posts after my last post is sposed to have a red folder beside it. However, many times I notice the folder stays it's default colour, when infact there are unread posts after mine. Any idea why?

Nope, though I am using FireFox and they appear correctly...

I'd blame Firefox's cache, as it can be very aggressive (this is why I disable caching in my browsers, beyond that of images), though cookies might play a part in it.

If you see this happen again, try clearing the cache (Tools > Preferences, and one of the tabs in here) or press CTRL+F5 and see if that fixes it.

But doing a hard refresh like that wouldn't solve the problem permanently. Is there a cache setting I can change to fix it once and for all?