InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now. Learn more →
Top 23 JavaScript Extension Projects
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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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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Sevalla
Deploy and host your apps and databases, now with $50 credit! Sevalla is the PaaS you have been looking for! Advanced deployment pipelines, usage-based pricing, preview apps, templates, human support by developers, and much more!
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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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PreviewMarkdown
QuickLook Markdown preview and icon thumbnailing app extensions for macOS Catalina and beyond
Project mention: Apple Notes Expected to Gain Markdown Support in iOS 26 | news.ycombinator.com | 2025-06-04Part of the point of Markdown is that it's supposed to read like plain text - many of the elements is what was commonplace on usenet and in email.
If you're on macOS though, the best option for rendered Markdown is a quicklook plugin. There are a few around - I like [1] though.
[1]: https://github.com/smittytone/PreviewMarkdown
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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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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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Google-Random-Number-Generator-Override
Replaces google random number generator. Fake psychic intuiton by holding shift
Project mention: Show HN: A browser extension to control Google's Random Number Generator | news.ycombinator.com | 2025-07-03 -
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 -
SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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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Build your own image gallery CMS
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Detect when your installed Chrome extensions have changed owners
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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 - InfluxDB
www.influxdata.com | 1 Sep 2025
Index
What are some of the best open-source Extension projects in JavaScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | numi | 6,122 |
| 2 | notion-enhancer | 4,947 |
| 3 | CEP-Resources | 1,753 |
| 4 | ca-archive | 507 |
| 5 | vertical-overview | 311 |
| 6 | youtube-ambilight | 109 |
| 7 | link_cleaner | 86 |
| 8 | json-formatter | 84 |
| 9 | PreviewMarkdown | 57 |
| 10 | scriptlet-doctor | 56 |
| 11 | quarkiverse | 48 |
| 12 | productivityowl | 37 |
| 13 | AutoPause | 36 |
| 14 | speed-start | 12 |
| 15 | password-backup-tool | 11 |
| 16 | save-all-images | 11 |
| 17 | TwitchLiveChannels | 7 |
| 18 | G-Meet-Auto-Join | 7 |
| 19 | Lichess2Chess | 3 |
| 20 | wikiref | 3 |
| 21 | extension-pack | 2 |
| 22 | Google-Random-Number-Generator-Override | 1 |
| 23 | bye-for-you | 1 |
Sponsored
InfluxDB – Built for High-Performance Time Series Workloads
InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com