URLColors

A chrome extension that adds a colored border around websites that match user inputted preferences.

As of May 2026, URLColors has 9,000 users and a 4.71/5 rating from 45 reviews in the Developer Tools category.

Usersno change0%
9.0K
9,000
Ratingno change0%
4.71
45 reviews
Reviewsno change0%
45
Version
2.2
Manifest V3

Permissions & access

Permissions
storagetabsscripting
Host access
https://*/*

Screenshots

URLColors screenshot 1

About

This extension allows you to flag specified websites by highlighting the website with a custom colored border.  This is especially useful for developers who run their web applications on many different environments and who are constantly switching between a dev, test, and production version of an app or database.  Because the application may look the same on all environments, it's easy to accidentally do something on the production environment that shouldn't have been done.  

With URL Colors, you can easily have the browser flag important websites for you by specifying a the keyword to match against the tab url, the border color, width, opacity, whether or not the border should blink, and the interval of blinking.  The wildcard character (*) is now supported.

It also has a demo mode, or snooze mode, so you can shut if off while presenting for a specified period of time, without worrying about reactivating it later.  It automatically turns back on for you!

Want to add functionality or tweak something?  Please contribute here: https://github.com/fej-snikduj/URLColors/

Thanks to @dzoba for developing this with me!

Technical

Version
2.2
Manifest
V3
Size
18.07KiB
Min Chrome
88
Languages
1
Featured
No

Metadata

ID
jjccpcminoppplpmcfghflolejbdkekm
Developer ID
u1e2bc3225efc122c36a6af5c976b9b8e
Developer Email
[email protected]
Created
Jul 2, 2017
Last Updated (Store)
Mar 5, 2024
Last Scraped
May 26, 2026
Website
Support URL

Similar extensions

Alternatives to URLColors, ranked by description similarity.

Data sourced from the Chrome Web Store · last verified May 26, 2026.