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Top 23 JavaScript Extension Projects
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Numi is a text-based calculator that lets you type things like "25% of $400" or "3 hours 20 minutes in seconds" and just get the answer. It handles unit conversions, currency, time zones, and variables. Think of it as a scratchpad that does math.
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vertical-overview
Gnome has had vertically stacked workspaces for a long time. The Gnome 40 update unfortunately made the switch to a horizontal layout. A choice that many Gnome users disagree with. This extension completely replaces the new Gnome overview with something that resembles the old style.
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PreviewMarkdown
QuickLook Markdown preview and icon thumbnailing app extensions for macOS Catalina and beyond
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AutoPause
Browser extension to pause other audio and video sources if audio is playing on the active tab with automatic resume, fast forward and media controls.
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speed-start
Speed Dial & Start Page with flexible layout for fast access to sites via visual bookmarks for Firefox, Pale Moon and SeaMonkey.
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json-formatter
A Browser Extension to format JSON in the browser automatically. Available with 60+ Themes, Syntax Highlighting, automatically linkifies links and more. (by arnav-kr)
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TwitchLiveChannels
Twitch Live Channels helps you keep track of who is LIVE out of the channels you follow on Twitch (https://www.twitch.tv/).
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bye-for-you
Bye "For You" 👋 Is a browser extension that removes the "For You" tab from X (Twitter) and automatically defaults to the "Following" timeline.
Project mention: Show HN: A browser extension that removes the algorithmic X 'For you' evil tab | news.ycombinator.com | 2025-07-07 -
Project mention: Open-Source Bionic Reading Chrome Extension (MIT) | news.ycombinator.com | 2026-02-22
A free Bionic Reading extension that helps with ADHD and reading speed. It processes the text entirely locally.
License: MIT
Chrome Web Store: https://chromewebstore.google.com/detail/cllpokdpfkelkceomncfgebkegnjepdc?utm_source=item-share-cb
Source Code: https://github.com/the0cp/citius-vide
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
JavaScript Extensions discussion
JavaScript Extensions related posts
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Ask HN: How can we help Firefox not to dissapear?
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Does anyone know if there is a XKit Rewritten equivalent for Pale Moon?
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Mimicking the Pale Moon Effect in Older Versions of Firefox
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Best alternatives to Firefox 56.0.2?
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which has the most extensions
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A note from our sponsor - SaaSHub
www.saashub.com | 14 Jun 2026
Index
What are some of the best open-source Extension projects in JavaScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | numi | 6,436 |
| 2 | notion-enhancer | 5,017 |
| 3 | CEP-Resources | 1,821 |
| 4 | ca-archive | 524 |
| 5 | edge-developer | 436 |
| 6 | vertical-overview | 313 |
| 7 | youtube-ambilight | 127 |
| 8 | link_cleaner | 86 |
| 9 | PreviewMarkdown | 64 |
| 10 | scriptlet-doctor | 58 |
| 11 | quarkiverse | 54 |
| 12 | productivityowl | 44 |
| 13 | AutoPause | 41 |
| 14 | speed-start | 12 |
| 15 | password-backup-tool | 11 |
| 16 | save-all-images | 11 |
| 17 | G-Meet-Auto-Join | 8 |
| 18 | json-formatter | 7 |
| 19 | TwitchLiveChannels | 7 |
| 20 | bye-for-you | 6 |
| 21 | citius-vide | 4 |
| 22 | extension-pack | 3 |
| 23 | wikiref | 3 |
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