I stumbled across this and it blew my mind. I figured I'd share it here for those who don't know about it already. This is straight from the site http://www.mozila.pl/blog/speed-up/ I thought this was worth sharing.
i agree....id avoid. if it were a real benefit the people who wrote firefox would have it as standard, plus the website mozila.pl may be fake, i dont know: i darednt click on the link. how did i know? mozilla is spelt with 2 'l' s.....oh, and i doubt it has any conncetions to poland.
This was a Fark Link a few days ago - Firefox ‘Hacking’ which is a bit more technical I guess in terms of more settings and differentiating between broadband and dial-up users. Seriously, if you have broadband and need to tweak Firefox because your browsing speed is slow, there is something seriously wrong here. If you just want to browse the web fast, regardless of broadband or dial-up, get Opera which is faster without having to resort to so called hacks - Download link Here
Theres a different way of doing this that I saw in a post on another forum that was closed. I did it and it worked, its the same as this just done in a different way. So yes, this works.
if value does not appears add it your self , don forget it is a bloolean value browser.tabs.showSingleWindowModePrefs true
Yes, This does work, I used it on an earlier version of FF I tried to do it again on my mac now, but it seems the file no longer exists. It is safe, dont worry!
I had read the same thing on a blog about 1 year back Anyways now I use a software for setting those things