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Top 23 JavaScript Addon Projects
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ClearURLs-Addon
ClearURLs is an add-on based on the new WebExtensions technology and will automatically remove tracking elements from URLs to help protect your privacy.
Project mention: Hardening Firefox – a checklist for improved browser privacy | news.ycombinator.com | 2025-08-30Is this available as text, ideally with the explanations as comment blocks?
Happy to see you recommend uBlock Origin and LocalCDN. I would humbly suggest ClearURLs might belong to that list. Another excellent "set it and forget it" extension that skips common tracking redirects.
https://addons.mozilla.org/firefox/addon/clearurls/
https://github.com/ClearURLs/Addon
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FastForward
Don't waste your time with compliance. FastForward automatically skips annoying link shorteners.
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Project mention: Show HN: Turn a paper's DOI into its full reference list (BibTeX/RIS, etc.) | news.ycombinator.com | 2025-06-22
There's a plugin that can do this. It is a little rough around the edges but can extract references from the pdf and search semantic scholar / crossref with decent reliability.
https://github.com/MuiseDestiny/zotero-reference
As a disclaimer, I am not associated with its development.
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nightTab
A neutral new tab page accented with a chosen colour. Customise the layout, style, background and bookmarks with nightTab.
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> Librefox on the linux device.
Librefox hasn't been updated since 2019:
https://github.com/intika/Librefox/commits/master
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CookieMonster
Addon for Cookie Clicker that offers a wide range of tools and statistics to enhance the game
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cookie-quick-manager
An addon to manage (view, search, create, edit, remove, backup, restore) cookies on Firefox.
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Project mention: Fear and denial in Silicon Valley over social media addiction trial | news.ycombinator.com | 2026-03-28
I use this extension on desktop and Firefox mobile to block shorts. They also support chrome (idk about chrome mobile).
https://github.com/Vulpelo/hide-youtube-shorts?tab=readme-ov...
You can also look at NewPipe on Android if you want an alternative YouTube app rather than web mode. Needless to say it's a real shame you have to work this hard to hide shorts...
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It would be great if they restored the `Smart Bookmarks` feature they removed a number of years ago. Smart Bookmarks were fantastic. Add your favorite sites' RSS feeds to your bookmark toolbar and you'd have all the recent headlines from all your favorite sites at one click. Fortunately I wasn't the only one that appreciated this long neglected feature so someone created Livemarks (https://github.com/nt1m/livemarks/) that mostly replicated its functionality, but it's not quite the same as having native support for them.
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swift-selection-search
Swift Selection Search (SSS) is a simple Firefox add-on that lets you quickly search for some text in a page using your favorite search engines.
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CookieBlock
Repository for the CookieBlock browser extension, which automatically enforces user privacy policy on browser cookies.
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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 Addon discussion
JavaScript Addon related posts
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Fear and denial in Silicon Valley over social media addiction trial
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Browser extension (Firefox, Chrome, Opera, Edge) to redirect URLs based on regex
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Coming Full Circle: It starts and ends with Git and GitHub
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FastForward: Bypass link shorteners, don't waste time getting to the final link
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Why are so many mods moving over to Modrinth?
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Firefox fails to install the FastForward extension and gives a "Download failed" error message. HELP
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Digital Iowa library batch downloading?
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A note from our sponsor - SaaSHub
www.saashub.com | 6 Jun 2026
Index
What are some of the best open-source Addon projects in JavaScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | ClearURLs-Addon | 4,886 |
| 2 | treestyletab | 3,762 |
| 3 | FastForward | 3,763 |
| 4 | zotero-reference | 2,753 |
| 5 | nightTab | 2,025 |
| 6 | Librefox | 1,773 |
| 7 | maxurl | 1,544 |
| 8 | arcfox | 1,249 |
| 9 | sieve | 878 |
| 10 | ScratchAddons | 810 |
| 11 | lovely-forks | 663 |
| 12 | app-node-red | 638 |
| 13 | CookieMonster | 547 |
| 14 | RESTer | 383 |
| 15 | XKit-Rewritten | 367 |
| 16 | cookie-quick-manager | 288 |
| 17 | hide-youtube-shorts | 287 |
| 18 | sauce4strava | 271 |
| 19 | livemarks | 256 |
| 20 | swift-selection-search | 253 |
| 21 | CookieBlock | 227 |
| 22 | PopUpOFF | 222 |
| 23 | RedditEnhancer | 215 |
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