The only reason I mentioned the free vs. paid FT, is I always watch the bottom of the Firefox window to see what specific site is taking so long to load, and lately (since the last major sluggishness that everyone experienced) the only times I see a major problem it's always during the loading of the ads, so you may very well be onto something there.
You just explained some of the "delay" of page loading I ran into occasionally. I used to think it's due to my light or unprecise touch of the mouse clicks while hastily moving between tabs/windows. (Yes, I have a handful of windows open but not as many as yours. I don't think I can handle more than 10. Don't you need at least 20 eyes to handle those 89 windows you open?

) I would always re-click the link if the destination page didn't load when I returned to it. (Hope you are following me.)
But I may have spoken too fast in terms of the free vs. paid FT. After reading your post, I tried to think of the recent FT ad/banners I saw. I couldn't think of any. Like I said, I am not techie enough to tweak the host thingy. (Yes, I read it somewhere before.

) I double check my Firefox Tools. I have the ....... Plus. (Don't recall if that's an add-on feature or what.) Usually I "implement" the IT tips that's useful to me from the articles/posts I read (from our FT, PC Mag or some lucky sighting

), then I forget about what/where/how I do (it). (

)
My point is I am (essentially) using the free version without the ad (thanks to ....... Plus) and I don't have the issue of slow FT. If the ad server, as you had suggested, is one potential problem, we''ll need to know if
Dovster and
coachrowsey are on the paid FT (or if they use any adblocker). If they are on paid version, then we'll have to rule out this explanation.
ps. Sorry my posts tend to be long because I can only use the layman language to explain myself (and pretend that I think like a potential pro).