This is my favorite firefox add-ons colections. I always use this add-ons in my firefox browser. It's extreamly usefull
The simplest YouTube Video Downloader for all YouTube Flash sites, period.
The first and only download manager/accelerator built inside Firefox!
FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.
See Google Pagerank (PR) and Alexa rank for each website you visit. Simple and customizable. You can see and use everything the toolbar offers, or strip it down to the bare essentials and place it in the status bar. Simple, quick, and very useful.
Just a simple extension to highlight links in a page according to nofollow / dofollow status.
Collections are groups of related add-ons that anyone can create and share.Explore Collections