Revised 2021.06.07
The following are my preferred Firefox/Waterfox extensions:
- AdBlocker Ultimate
- ColorZilla
- Disable HTML 5 Autoplay
- Firebug
- Flagfox
- Honey
- MeasureIt
- Slickdeals: Automatic Coupons and Deals
- Tree Style Tab
- User Agent Switcher and Manager
- Wappalyzer