Don't know if plugs are allowed (and I'm in no way affiliated with the project), but knowing that a lot of folks have varying issues with browsers I just wanted to share that I have been using Pale Moon since about July (having become fed up with Firefox's constant crashing, etc...) - and have been nothing but satisfied with it's performance.
It is Firefox-based (and essentially without difference, from a user's perspective), but customized for a Windows operating system (sorry Macs): I have found it to be fast, and bug-free.
So... if anyone is looking to "upgrade" their Firefox, ya might give Pale Moon a look-see.
Sadie out.