Web Mask icon

Web Mask

by Frank Ren · Developer Tools
Manifest V3 Free
View in Chrome Web Store Data as of 16 Oct 2026

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
668129Aug 2023Apr 2025Oct 2026
Latest, 16 Oct 2026: 114 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years
001Aug 2023Apr 2025Oct 2026
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

WindowUsersChangeRatingsRating
7 days+2+1.8%00.00
30 days+5+4.6%00.00
6 months−8−6.6%00.00
1 year+4+3.6%00.00

Chrome Web Store search rankings

Where Web Mask appears when people search the store, with the 30 day change
Search phrasePosition30 days
override#77−2

Version history

14 versions recorded
2.619 Sep 2025
2.59 Apr 2025
2.424 Apr 2024
2.315 Apr 2024
2.29 Apr 2024
2.125 May 2023
2.019 Dec 2022
1.111 Dec 2022

Details

Category
Developer Tools
First seen
7 Sep 2022
Size
47 KB
Languages
en-GB
Pricing
Free
Support
github.com
Extension ID
cnglippokopaohjfeejlkblfjnekojia

Permissions and risk

Moderate riskimpact 3, likelihood 2
Permissions
declarativeNetRequestWithHostAccesswebRequest
Site access
*://*/*
Can read and change data on every website you visit.

Alternatives to Web Mask

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