Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
Log in
Preview of MRM Tab Highlighter

MRM Tab Highlighter by Mohammed Ridha Mohammed Mohammed

Color and tag your tabs by website address. Set a rule once for a whole domain, a subdomain or an exact host, and every matching tab shows its color and tag in the tab icon and title, e.g. 🟥 [PROD].

ExperimentalExperimental
0 (0 reviews)0 (0 reviews)
Download Firefox and get the extension
Download file

Extension Metadata

About this extension
Tab Highlighter helps you tell sites apart at a glance – production vs. test, client A vs. client B – by coloring and tagging tabs based on their website address.

HOW IT WORKS
- Right-click any page, click the toolbar icon, or press Alt+Shift+H to open the editor for the current site.
- Choose the level: for x.p.host.it you can pick x.p.host.it, p.host.it or host.it.
- Choose the match: "this host and all its subdomains" or "this exact host only".
- Pick a color (presets or any custom color) and/or a tag such as PROD, TEST or Client A.
- Quick-color presets are also available directly in the right-click menu.

SMART RULES
- A rule on p.host.it covers p.host.it and x.p.host.it, but never the higher level host.it.
- Every page path of a matching host is included.
- When several rules match, the most specific one wins.
- Color and tag are resolved separately, so host.it can give the tag while p.host.it gives the color.

WHAT YOU SEE
- Colored tab icon with the tag's first letter (or the site icon with a color ring).
- Color mark and tag at the start of the tab title, e.g. 🟥 [PROD] My App.
- Optional: matching tabs grouped into a tab group named after the tag (on Firefox versions that support tab groups for extensions).
- Optional: a colored bar or frame and a tag label on the page.

MANAGE EVERYTHING IN ONE PLACE
- Edit, enable/disable and delete all rules in a single table.
- Test any URL to see which rule applies.
- Import and export your rules as JSON to share them with your team.

PRIVACY
Tab Highlighter collects no data and sends nothing anywhere. Your rules are stored only in your browser's own storage. The "access your data for all websites" permission is used only to read each tab's address and draw the color and tag on matching sites.
Rated 0 by 0 reviewers
Log in to rate this extension
There are no ratings yet

Star rating saved

5
0
4
0
3
0
2
0
1
0
No reviews yet
Permissions and data

Required permissions:

  • Access browser tabs
  • Access your data for all websites

Optional permissions:

  • Access your data for all websites

Data collection:

  • The developer says this extension doesn't require data collection.
Learn more
More information
Add-on Links
  • Support Email
  • Copy add-on ID
Version
1.3.0
Size
35.75 KB
Last updated
a month ago (Oct 9, 2026)
Related Categories
  • Web Development
  • Appearance
  • Tabs
License
MIT License
Version History
  • See all versions
Add to collection
Report this add-on
Go to Mozilla's homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Download

  • Download Firefox
  • Windows
  • macOS
  • iOS
  • Android
  • Linux
  • All

Latest Builds

  • Nightly
  • Beta

Firefox for Business

  • Enterprise

Community

  • Connect
  • Contribute
  • Developer

Follow

  • Instagram
  • YouTube
  • TikTok
  • Bluesky
  • Podcast
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version.