Alrighty, I've been seeing the same slow/no-load-on-first-attempt stuff.
Tonight on a different machine, I got this:
Now, I have no idea why Firefix is attempting to light-up Adobe for the main forum page. However since the Adobe Reader is such a slow pig of a program these days, it may be the problem.
Where on the main page that Firefox thinks there is something for Adobe to do, would be the cause. Perhaps some new artwork or something....