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Preview of Chrome Mask

Chrome Mask by Dennis Schubert

Makes Firefox wear a mask to look like Chrome to websites that block Firefox otherwise.

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Screenshots
Screenshot of the addon showing it in its enabled state. A large text is visible, it says "The mask is on! I pretend to be Chrome on this site.". Below it is a green toggle button showing the Chrome logo.
About this extension
A little Firefox Extension that provides a one-click toggle to spoof as Chrome in Firefox - or, in other words, to put on the Chrome Mask. There are a lot of generic "User Agent spoof" extensions. However, this extension does a few things differently:
  • Instead of overriding the User Agent string on all sites, this extension allows you to only look like Chrome on specific sites.
  • Unlike some extensions with outdated version numbers and UA strings, this extension automatically updates the Chrome version it pretends to be. It does that by querying a simple API every 24 hours.
  • You don't have to pick the correct Operating System manually; this extension does it for you.
  • This extension also shims a few additional JavaScript attributes, like navigator.vendor or the global chrome object, to pass common browser checks.
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This add-on needs to:

  • Access browser tabs
  • Access your data for all websites
More information
Add-on Links
Version
5.0.1
Size
54.22 KB
Last updated
a month ago (Mar 17, 2025)
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License
MIT License
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Version History
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Release notes for 5.0.1
  • Added a settings UI to add or remove sites from Chrome Mask without being on that site. Thanks to @dannycolin for the initial prototype here.
  • Added an explicit warning to only use Chrome Mask on sites that claim "Firefox is not supported", because using it on other sites will break things.
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