r/FirefoxAddons

I built a free dark-mode extension that works on literally any site
Most "dark mode" extensions either only work on a few big sites or make every photo look like a negative. Blackout applies a smart filter to every page, keeps images/video in normal color, lets you tune brightness/contrast/sepia per site, and can auto-schedule day/night. No account, no tracking, no ads — MIT-ish free.
Chrome/Edge/Firefox zips + install guide: https://alainabo.github.io/blackout/
Would genuinely appreciate feedback/bug reports — first real project I've shipped like this.

After X removed the grid view from profile media tabs, I built a small extension that restores the original media grid. It only runs on X, collects no data, and makes no external requests.

Will work on all Chromium-based browsers, such as Google Chrome, Microsoft Edge, Opera, Brave, Vivaldi, and Arc.

The source code is available on GitHub:

https://github.com/QuantumDeus/x-media-grid-restore

greasyfork Script:
(Recommend to use with Violentmonkey‬)

https://greasyfork.org/scripts/591463-x-media-grid-restore

cannot add extensions in firefox android I have used previously in another phone. even if i click "download file" i cannot open it.

Hello everyone,

I'm happy to introduce to you a way to hide, blur and censor words on FireFox, tested on Mobile.

Check it out - https://censorly-extension.base44.app/

Thank you,

Shawn

I was reading that someone on here made ascript for this, but Im not very savvy and, they kept making mistakes and uploading new scripts, so I was like wait a minute what if I just "block it with my ad blocker??" I used uBlock Origin, (Add-on) I'm using Firefox, so open the transcript, right click on any of the timestamps, click "Block Element" a box appears. click "pick", click any timestamp, It will highlight in red. click "Create" Done.

The screenshot I added you can see there is none, look at the bottom right hand corner. I made sure to get the current date and time to prove this was not taken from before the UI change.

I build Konode, a browser sync extension with an unusual premise: there is no Konode account and no Konode server. It syncs your bookmarks, open tabs, history and installed-extension list straight to storage you already own, your Google Drive, a GitHub repo, or any WebDAV server. Optional end-to-end encryption on top, so your storage provider cannot read it either.

Works on Firefox, Waterfox and other Firefox and Chromium based browsers.

🎉 1.2.0 is out, and most of it are fixes 🎉

History between devices actually works here now. It barely did before. Konode sent each page along with its original visit date, and Chromium rejects the whole request when that date is present rather than just ignoring the date. So nearly every page from another device was turned away, and the reason was being discarded before anyone could see it. If you tried history sync and got a lot of nothing, that was this, and it is gone.

Bookmarks are no longer silently dropped. When the receiving device had fewer bookmarks in a folder than the device sending them, the browser rejected the position Konode asked for and the bookmark disappeared without a word, on every sync, indefinitely. Konode now asks for a position the browser will accept.

Renaming a bookmark or a folder reaches your other devices. It used to reach none of them. The rename carried no timestamp, so no device could tell whose title was newer and the safe thing was to change nothing. Renames now carry one and the newest wins. Folders are renamed in place, instead of a second folder appearing under the new name.

Deleted bookmarks stay deleted. Deleting several at once fired several events that overwrote each other's record of the deletion, so only one was remembered and the rest came back from your other devices on the next sync. Each deletion is recorded separately now.

Switching storage provider uploads your data again. Konode skips an upload when nothing has changed, but it used to compare only the data, not where that data was going. After switching provider the new location sat empty while the popup reported a clean sync. It checks the destination too.

Also in this release:

• a device list, so you can see every machine writing to your
• sync folder by name, and remove one you have retired.
• settings has been rebuilt, follows your browser's font-size setting, and fits a narrow window.
• the activity log keeps warnings instead of turning over every 17 minutes and losing them

Install: https://addons.mozilla.org/en-US/firefox/addon/konode/

Source: https://github.com/konabe-studio/konode

Bugs and ideas: https://github.com/konabe-studio/konode/issues

The next update adds translations

The next release makes the interface translatable, and it ships with English, Hungarian and German. If you want your language in it, this is the part where help actually makes a difference. No coding and no GitHub account needed, it is edited in the browser:

https://hosted.weblate.org/projects/konode/

Someone already started Estonian (thank you!). If your language is not listed yet, you can ask for it there and it will appear. Anything left untranslated falls back to English, so translating only part of it is still useful.

Happy to answer anything. The history bug above was found by hand-testing on a second machine, not by my test suite, so reports genuinely land.

Hello everyone!

I'm currently working on my master's thesis (in Human Computer Interaction) and I'm looking for participants to test out a Firefox-Extension based tool that aims to promote mindful social media use.

So, if you (or anyone you know) are:

📱 an Android user

AND

🌀 has an unhealthy Instagram scrolling habit

Please fill out this short form to join the research study.

👉 https://forms.gle/LNhzMTjpNBRjyeaL7

Feel free to also share it with your peers/friends/ family groups.

I'd be super grateful for all the feedback ❤️

WebBrain is designed as an open-source, browser-native alternative to Claude Chrome: an agent that can read the page you're on, understand the context, and help you complete tasks directly in your existing browser session.

Instead of moving your work into a separate app, WebBrain works where you already work—across websites, forms, and everyday browser workflows. You stay in control: review what it has prepared, make changes, and decide when anything gets submitted.

It also works with open-weight, offline LLMs such as Qwen, Gemma, and DeepSeek through tools like LM Studio, llama.cpp, or Ollama. That means you aren't locked into ChatGPT, Claude, other proprietary providers, or subscription plans. If you prefer those services, you can use them too—the choice is yours.

The goal is a transparent, practical alternative for people who want browser automation and AI assistance without giving up visibility into the process.

Check it out at https://github.com/webbrain-one/webbrain

Would you use an open-source browser agent like this? What features would matter most to you?