Add-ons essential for everyday security. You also need to use startpage dot com, and HTTPS Everywhere and Privacy Badger from EFF dot org. For special privacy, use Torbrowser instead. X = Experts only
Add-ons useful for shopping (ie. finding cheaper prices).
Themed personas I like to install on other people's computers.
A collection of lightly-coloured, clean (not-too-busy) personas I use (in rotation with the Personas Rotator add-on).
Extensions which are great but use too much CPU - if you have some über six-core machine then they might be worth using.
Recommended for your default search engine: The search engine addon at startpage dot com.
Add-ons which fix bugs, improve security, or add functionality that should be included in Firefox by default. See also my collections "privacy essentials", "functionality" and "newbie-suitable".
My favourite add-ons, purely for aesthetics. I also recommend my collections "bugfixes", "functionality" and "privacy essentials".
My favourite add-ons to extend Firefox's functionality. I also recommend my collections "bugfixes", "privacy essentials", "pretty" and "newbie-suitable". X = may not be worth slowdown.
Only the most useful add-ons, recommended for everyone. I also recommend HTTPS Everywhere and Privacy Badger from EFF dot org. Also essential is my "bugfixes" collection.