If you love Firefox but still think it's a bit too slow, try Pale Moon instead!
The aim behind Pale Moon is to build a completely customized version
of Firefox that's tailored to make the most of your Windows system. Pale
Moon has rebuilt Firefox from source, optimizing the web browser to
obtain higher speed rates in page rendering, scripting and menu
managing.
Being based on Firefox, Pale Moon features the same stability and
reliability as the original browser, as well as support for Firefox
extensions and themes. You'll also be able to use most of the program's
features and options, though some of them – such as accessibility
options and parental controls – have had to be sacrificed in order to
use less memory.
Graphically speaking, Pale Moon is identical to Firefox, so you won't
notice any difference here. Now, are you really going to notice any
significant improvements in speed? That's probably something you will
only be able to tell in the long run.