Cow Finder by Joshua S. Tomlinson

Highlights specific names on web pages in yellow, like Ctrl+F but with multiple queries. You can also blacklist sites. Requires browser data permissions to save your settings and read sites, requires tab permissions to reload the site to do settings.

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You'll need Firefox to use this extension

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About this extension

Highlight specific names on webpages to help them stand out instantly.

Whether you're scanning forums, watching chat streams, or following discussions, Name Highlighter lets you customize and emphasize important names in real time. Add any names you want to track, and they’ll be automatically highlighted across supported websites. You can also block certain domains where the highlighting shouldn't appear, and toggle the extension on or off as needed.

Features:

Highlight names with a customizable list

Enable or disable highlighting at any time

Domain blacklist to avoid interfering with specific sites

Clean, intuitive settings menu

Lightweight and privacy-friendly

Perfect for moderators, streamers, or anyone who needs to track usernames on the web.

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Release notes for 2.0

Updates every 100ms on websites (will make this configurable later)

Required permissions: