Web Mask

It overrides resources, JS, CSS, Image, and fonts, of a website with the copies from a local web server.
What is Web Mask?
Web Mask is a Chrome extension that enables you to debug remote websites and test local changes by overriding resources, JS, CSS, Image, and fonts with copies from a local web server. It is built for Manifest V3 and is test automation friendly.

Extension stats

By: Frank Ren
Users: 66 ▼ -5
Rating: 5.00 (1)
Version: 2.4 (Last updated: 2024-04-24)
Creation date: 2022-09-07
Risk impact: High risk impact
Risk likelihood: Very low risk likelihood
Manifest version: 3
Permissions:
  • declarativeNetRequestWithHostAccess
  • webRequest
Host permissions:
  • *://*/*
Size: 50.15K

Other platforms

Not available on Firefox
Not available on Edge
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Extension summary

It enables you to

  • Debug a remote web site, for which source map is usually disabled, with your local web server
  • Test your local changes with actual data from remote servers - integration test before pull request

The idea and its implementation are based on HTTP and HTML web standards, independent to the framework of your choice, with the following constraints:

  • It doesn't work with document.write()
  • "Bypass for network" for service workers. See screenshots for instruction.
  • Web socket is not redirected, i.e. Hot module reload (hmr) or live reload doesn't work unless you can force their origin to localhost

It's similar to "Resource Override", but built for Manifest V3, and easy to integration into automated tests. See

See more

User reviews

Works like a dream!
View all user reviews

Extension safety

Risk impact

Web Mask requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk likelihood

Web Mask has earned a good reputation and can be trusted.

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