What are the best Firefox Add-ons?

A few weeks back, the best Chrome Extensions question went viral. I am curious, what is your favorite Firefox Add-on?
Your recommendation
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2 recommended
  1. 5
    Privacy.com for Firefox

    Get a new card for every purchase with just one click

    Stefan StokicCo-founder @ Slik.ai ยท Written
    Even though it's hard to pick one specifically, Privacy.com is my favorite. So much utility and makes managing my purchases amazing ๐Ÿ‘
  2. If I had to pick one add-on out of all existing add-ons... it would be uBlock Origin.