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Preview of Web Defuser

Web Defuser by Gear

Userscripts/styles on steroids. Keep YouTube or Instagram playing in the background, remove annoying nagging popups, add dark mode to websites, increase video volume past 100% and more!

Available on Firefox for Android™Available on Firefox for Android™
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Extension Metadata

Screenshots
Options UI with defined rules
About this extension
This extension's goal is to put control over web experience back into the hands of the user above all else. If you've ever been frustrated by some annoying website behavior or missing functionality, this extension will empower you to overcome that.

To achieve that, you can define rules to process any HTTP request as you see fit, including modifying headers, body and more.

Please check out the source code repository (with snippets section containing some example useful rules) and interactive documentation on rules.
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Permissions and dataLearn more

Required permissions:

  • Access browser tabs
  • Access your data for all web sites
More information
Add-on Links
  • Homepage
Version
1.1.0
Size
112.55 kB
Last updated
2 months ago (10 Jun 2025)
Related Categories
  • Web Development
  • Privacy & Security
  • Appearance
Licence
MIT Licence
Version History
  • See all versions
Tags
  • ad blocker
  • anti malware
  • anti tracker
  • antivirus
  • content blocker
  • privacy
  • security
  • user scripts
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Release notes for 1.1.0
Added more expressive request matching language

Fixed non-uft-8 sites being broken by body modification rules
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