It overrides resources, JS, CSS, Image, and fonts, of a website with the copies from a local web server.
Users
114
+5 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
1
0 in 30 days
Store rank
#80K
#67K among extensions
Version
2.6
updated 19 Sep 2025
Users
monthly, 3 years
Latest, 16 Oct 2026:114 usersMove the mouse over the chart for any month
Ratings count
monthly, 3 years
Latest, 16 Oct 2026:1 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About Web Mask
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 requires local server to respond with HTTP header, `Access-Control-Allow-Origin: *`. `*` can be replaced with the origin of your remote server.
- 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
- Resource Override, https://chrome.google.com/webstore/detail/resource-override/pkoacgokdfckfpndoffpifphamojphii
- Manifest V2 support timeline, https://developer.chrome.com/docs/extensions/develop/migrate/mv2-deprecation-timeline
- Test automation examples, https://github.com/renfeng/web-mask/tree/master/test/specs
Tests (in alphabetic order)
- An Angular website: https://material.angular.io/
- Source code: https://github.com/angular/material.angular.io
- Successful. Automated.
- A React website: https://reactjs.org/
- Source code: https://github.com/reactjs/reactjs.org
- Successful. Automated.
- A Vue.js website: https://vuejs.org/
- Source code: https://github.com/vuejs/docs
- Successful. Automated.
Growth
Window
Users
Change
Ratings
Rating
7 days
+2
+1.8%
0
0.00
30 days
+5
+4.6%
0
0.00
6 months
−8
−6.6%
0
0.00
1 year
+4
+3.6%
0
0.00
Chrome Web Store search rankings
Where Web Mask appears when people search the store, with the 30 day change