[bulatb]

Mine is opposite your opposite. :) On my 2.5GB, 1.8GHz Core Duo Thinkpad from 2006, Chrome handles dozens of tabs in multiple windows like a champ. Firefox pre-24 was noticeably slow with just a few tabs in a single window. It's been unusable for me since 2011.

[Yoric]

In Firefox, have you tried "Reset Firefox", in about:support? Most users report that this speeds up Firefox considerably.

[bulatb]

Thanks, I'll give it a try.