Adblock Plus
One of the most popular free ad blockers for Firefox. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
uBlock Origin
Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.
NoScript
The best security you can get in a web browser! Allow potentially malicious web content to run only from sites you trust. Protect yourself against XSS other web security exploits.
Clear Cache
Clear browser cache with a single click or via the F9 key.
ColorZilla
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
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