For web security researchers and anonymous usage. Here are some useful add-ons. Not everything you need to download just keep what handy for you. More add-ons here
- Modify Headers
- Cookies Manager+
- Disable WebRTC
- HackBar
- HTTPS Everywhere
- PassiveRecon
- SQL Inject Me
- XSS Me
- Tamper Data
- User Agent Switcher
- FoxyProxy
- Live HTTP Headers
- AdBlock Plus
- No Script
- FireBug
- Web Developer
- Wappalyzer
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