Right now, CPU use varies. 0% to 9% or so.
Ramwise, FF takes about 725 MB of my 4 GB.
_____
Some of the tabs are background tabs, where I opened under 17.01 & it crashed, so that I had to re-open.
Difference so far, under FF18b5 (yes, I know they just released the beta 6 the other day) is that it has not (yet) crashed when I opened those tabs, or chunked 50 or so NEW tabs to the background.
Hmmmm... What do I use them for... Sometimes, I look for themes for W7 or W8. In doing so, I might use a deviant art page with themes & d/l a theme by a user. But I know if a user has a good theme, they likely have other util/themes that are equally good. It is not unusual that I should then visit their page, & d/l other off their page (or check out their friends, since if they have good taste in what they do, they usually select friends who have good taste also).
What would I use themes for in 7 or 8? Some computers I have are older & do not support 7 Aero. You can get graphics cards that do, but in the sake of experimentation, it is very interesting how cool Royale port to 8 looks on non-aero capable computers. Very much different than the bland default basic that is enabled if your PC does not support Aero.
I may have to use it on 8 when I play around with it more, to see how it looks on 8 as well. Might have to find a way to n-lite my 8 to remove things I never use (Such as windows store). It's not that I don't shop online sometimes, but I just don't trust a built in undeletable store icon. (Why is it imperative to have "mandatory" store service?) You can disable the service. I rather just re-do my W8 dvd so that it don't have those things installing in the 1st place. I am likely to not get any apps, as I have most things I need already. So it would be useless on my machine.
_____
Other things I use it for, are sometimes when I download new programs, I kick the downloads to background tabs. So I can continue without interruption on the page I am on, & download faster than ever (no return to prior page, then find the download I was at, etc).
Sometimes I also have youtube videos open (I play drums, & I crank my stereo so I can jam).
There are a lot of things I look up & its faster to open 10-12 tabs, then check them out, rather than open/backspace/open another/backspace etc.
I may not always open hundreds of tabs. But in the name of research, downloads, youtubing, & others... I tab out FF. ![:)]()