Highlight This: finds and marks words

Name: Highlight This: finds and marks words
Rating: 4.0244 (82 reviews)
Author: Wim Deboel

By: Wim Deboel

Automatically finds and highlights words and phrases on the web page according to your list

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Features & Capabilities

Highlight This is a powerful Chrome extension that automatically finds and highlights defined words and phrases on any web page. Designed for easy use with no registration needed, it lets you organize keywords into color-coded lists and supports unlimited words. The extension refreshes highlights dynamically even on AJAX pages and offers advanced features like regex matching, case sensitivity, and clickable highlights.

All your data is stored locally for privacy, with options to import/export lists or use external sources like Pastebin or Google Sheets. Now with over 30,000 users and available on Firefox too, Highlight This helps you quickly spot important terms, making browsing and research more efficient and visually intuitive. It’s free and packed with flexible customization for personal or professional use.

User Growth & Download Statistics

Add-on Developer Tools Education Accessibility

By:

Daily users:

Rating:

Version:

5.2 Last updated: 2020-10-02

Version code:

5109438

Creation date:

2019-01-05

Risk:

Permissions:

Content scripts matches:

<all_urls>

Size:

1.53MB

Email:

wi*****@deboel.eu

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-15

Compare stats and ranking:

Ranking

# 1,874 ▲ 3

Other rankings

#220 in Search Tools ▼ 1

#294 in Appearance ▲ 2

#8 in phrase keyword 11 ▼ 1

#21 in highlighter keyword 51

#42 in delight keyword 3 ▼ 2

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Other platforms

Highlight This: finds and marks words (v6.3.12)

100,000 3.78

(429)

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Wim Deboel

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/highlightthis/

Email:

wi*****@deboel.eu

Website:

http://www.deboel.eu/HighlightThis2.html

User Reviews

Users broadly praise Highlight This as an effective highlighter with clear visual cues, especially for ads. It is described as very useful and sometimes essential. However, recurring issues include backup/restore problems across Firefox and Chrome, cross-browser compatibility, occasional highlighting inconsistencies and color-mapping bugs with regex patterns. Usability and learning-curve concerns also surface, along with a few claims of intrusive behavior. Overall, the highlighting capability is valued, but reliability and cross-browser support need attention.

Pros

Effective highlighter that marks words as users need.
Provides clear visual cues (e.g., highlighting ads and sponsored content) for quick scanning.
Widely regarded as useful and positive by multiple reviewers (e.g., 'perfect', 'very useful', 'so good').
Described by some users as must-have and highly valued for browsing experience.

Cons

Backup/import/export features do not work reliably in Firefox and are not compatible with Chrome backups; cross-browser/version issues.
Highlighting can be inconsistent, missing or mis-marking certain words or patterns.
Color assignment can break with complex regex patterns (Lookahead/Lookbehind).
Not very intuitive; setup and list management can be confusing.
Some users report intrusive ad behavior or ads injected by the extension.

Recent reviews

Please add the dark mode to the UI. "Highlight on these sites" set to "www.linkedin.com/jobs/*" but it also works on linkedin.com/feed/*

by Vi*****, 2026-06-10

This Firefox Add-On does not work at all. I can't create lists (the save button doesn't save the settings), I can't import settings (on the import page the buttons to import don't appear). I've tried a lot of things to get this to work, but it's dysfunctional. I hope the dev comes back and fixes it because it works great on Chrome.

by C*****, 2026-05-27

The ONLY highlighter, that works the way I need it.

by An*****, 2026-03-29

View all user reviews ›

Is Highlight This: finds and marks words Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Highlight This: finds and marks words requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Highlight This: finds and marks words has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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