I'm wondering if there might be a way to "clean up" FireFox & maybe make it run a bit faster. It runs fine, but ya know, I like speed

I have several Addons & I'm wondering if they might be slowing down FireFox. Some of them I just have to keep, like the Multirow bookmarks toolbar thingie. But I noticed that there are several "Java Console" addons, versions:
6.0.16
6.0.20
6.0.17
6.0.22
6.0.21
6.0.23
Should I uninstall/remove all but the latest version?
And also there is something called Microsoft.NET Framework Assistant 1.2.1
Do I need that? LOL
I know I could Google all this, but y'all know how I am

No rush on any of this!
Luv y'all!
And btw, I don't actually say "y'all" in real life.
