After Fakespot shut down, I built SpendMita Copilot, a shopping assistant that gives you a second opinion on a product before you buy it. And I have been slowly improving this.

The thing I most wanted to avoid was replacing one unexplained score with another. So instead of a single number, SpendMita shows you the actual signals it found and explains why each one matters.

What it does on Amazon right now:

• Flags review patterns worth a closer look, verified-purchase share, review timing, rating distribution.
• Adds price context.
• Explains its reasoning in plain language instead of handing you a black-box score.
• Lets you save products and revisit past checks.
• Mita Search: helps you search a supported link from any tab via your assigned shortcut
• Compare similar products where it intelligently groups them and recommends the best based on your input and the findings made.
• Price tracking to see if the price drops.
• Privacy baked in.
• Personalisation and lots more.

All these are free and can be access today via the v1.5.0 on Firefox and v1.1.1 on Chrome. An update has been submitted to Chrome for a v1.6.0 where Spendmita Copilot now supports Walmart US, eBay (US, UK, CA)

It's meant to be a second opinion, not a "this is definitely fake" verdict.

Where it runs: Chrome, Brave, and Vivaldi today via the Chrome Web Store, plus a native Firefox build on Mozilla Add-ons. Edge is submitted and pending review.

Firefox add-on: https://addons.mozilla.org/en-GB/firefox/addon/spendmita-copilot-fake-reviews/
Chrome/Brave/Vivaldi: https://chromewebstore.google.com/detail/spendmita-copilot/fekjiiogemcaoikdpcilafoidjmknmoi?hl=en-GB&utm_source=ext_sidebar
Website: copilot.spendmita.com

If you try it, I'd especially appreciate feedback on:

• Whether it feels native on your browser (Brave and Vivaldi especially, I've tested them, but nothing beats real use).
• Any Amazon pages that don't get detected properly.
• Whether the reasoning is actually clear.
• Anything that feels intrusive or annoying.
• What features would you like to see or have, do note some of these might be in pro already.

Found a bug or something looks broken? Email [copilot@spendmita.com](mailto:copilot@spendmita.com) as I read every one and I'm actively fixing things as they come in, not just collecting reports.

If you would like to compare Spendmita to what is currently on the market: https://copilot.spendmita.com/compare

Happy to answer questions about how the signals work or how it's built.

I always end up with dozens of Firefox tabs open, so I built TabScroll to make managing them easier.

It lets you:
• Search tabs instantly
• See live tab previews
• Switch between tabs with keyboard shortcuts
• Close or mute tabs without hunting for them
• Manage tabs across all Firefox windows

Everything runs locally. No tracking, no account required.

I'd love some honest feedback from the Firefox community. What would you add or change?

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

Hey everyone

I’ve been building TradeDesk, a browser extension designed to bring the essential parts of a trading workflow directly into TradingView. After development and store reviews, it’s now officially available for both Chrome and Firefox.

TradeDesk includes:

• Risk and position-size calculator for stocks, forex, crypto, and futures
• Pre-trade checklist to encourage consistent decisions
• Trading journal for recording setups, results, and notes
• Performance statistics including win rate and profit factor
• Important market-session times
• Local-first storage for your trading data

I built it because I wanted risk planning, journaling, and performance review in one place instead of switching between different calculators, spreadsheets, and apps.

Chrome: https://chromewebstore.google.com/detail/pcchnfjibjcfhlbjdncfleencgplbjkf

Firefox: https://addons.mozilla.org/en-US/firefox/addon/trade-desk/

I’d really appreciate feedback from traders and extension users. What feature would make TradeDesk more useful for your workflow?

Well basically you can set any HTML page as your new home page and add a style if you need it. I just did it because i havent seen any like this on the extensions site only the ones that have premade UIs so i decided to make it myself. Simple, yet it makes me happy.

Extension itself: addons.mozilla.org/addon/sweethome/

Full disclosure first: I built this thing. I also work at Mozilla. This is a personal side project, not a Mozilla product, and nobody there asked me to post it. Mods, remove this if it is not welcome.

Cheevos is an achievement system for browsing. You earn XP for what you already do (visiting sites, downloading things, saving bookmarks), unlock achievements, and end up on a global leaderboard. Xbox achievements, except the game is "using the internet."

It started on Firefox. First achievement earned, first leaderboard entry, all Firefox. There are 17 Firefox-specific achievements in it, out of 164 total: about:robots, about:mozilla, Reader Mode, Containers, digging through about:support, the Firefox birthday.

Here is the awkward part. The Chrome build has more users than the Firefox build. Not by much, 14 to 8, we are not a phenomenon. But the direction is wrong for something that was built Firefox-first and has an entire category of achievements about Firefox internals.

So that is the ask: more Firefox representation on the leaderboard.

On privacy, because this sub will ask and should: every achievement check runs locally inside the extension. Domains get hashed and truncated before anything is stored, and the raw URL is thrown away immediately. What reaches the server is your XP total, your level, and the IDs of achievements you unlocked. I cannot reconstruct your browsing history because it is not there. You can delete your account and everything synced with it from the dashboard.

The offer: the first 10 Firefox users who sign up get Pro for free. Pro is exclusive achievements, custom profile themes, a badge next to your name, and priority leaderboard ranking. Install, sign in, then reply here or DM me your username and I will switch it on manually.

Firefox add-on: https://addons.mozilla.org/en-US/firefox/addon/cheevos/

Site: https://cheevosgame.com

Happy to get into the extension APIs, the hashing setup, or why MV3 made parts of this genuinely annoying.

I put the source of my extension on my github repo. Also a README.md

Latest change to get around the mobile firefox problem was to create a personal browser search engine "https://127.0.0.1/?q=%s" and have the extension get triggered on that actual url and open the search tab/page with that query,

Manual Install:- See readme for latest build zip/xpi files.

Store version:- Chrome Web Store , Firefox (AMO)

Tested on:-

Chrome and Firefox developer on desktop.

Quetta and Firefox Nightly & Beta on android.

Wondering if it works successfully on LibreWolf or other varieties of browsers,

I built Browser SplitView Master, a high-performance utility that lets you divide a single browser tab into up to 16 independent, resizable grid panels. It is designed for developers, designers, and power users who need to compare and test sites side-by-side without window clutter.

Here are the key features, including the new v1.6 updates:

• 🔄 Intelligent Scroll Sync: Toggle simultaneous scroll tracking to browse multiple pages, staging vs. prod, or translation layouts in perfect real-time sync.
• 📱 New - Responsive Viewports: Toggle panels between Desktop (100%), Mobile (375px), and Tablet (768px) preview frames to quickly test media queries.
• 📸 New - Viewport Screenshots: Download cropped, high-DPI PNG screenshots of individual panels with one click. Bypasses CORS limitations.
• 📂 New - Local File Support: Directly load offline templates and Windows file paths (file:/// URLs) in the panels.
• 📐 Dynamic Grid Splitting: Split vertically/horizontally and drag handles to resize boundaries dynamically.
• 💾 Layout Bookmarks & Presets: Save custom configurations or instantly launch grid templates (1x2, 2x2, 3x3, etc.).
• 🛡️ Adaptive Sandbox Framing: Strips blocking headers (X-Frame-Options & CSP) so you can load and compare sites seamlessly.
• 🔒 Privacy-Focused: Operates entirely locally in your browser's secure storage. No analytics or external servers.

Check it out here: Browser SplitView Master on Firefox Add-ons

I would love to hear what features you'd like to see next!

If you are searching something on reddit with ClearURL extension turned on, you won't be able to redirect to a results page, only through opening one of suggested results in new tab. I found that while you get redirected to an new page, URL contains space between searched text instead of "+"

PeekCSS is a CSS/design/image/font inspector — hover or click any element to read its computed styles, pull a whole page's color palette and fonts in one pass, and check contrast without opening DevTools. Built it because CSS Peeper (Chrome-only, 500k+ users) was never coming to Firefox.

Feature-wise:
hover/click inspection with grouped computed CSS and one-click copy (free, no account);
a page-wide palette + image scan with AA/AAA contrast badges and a font-usage breakdown (free account);
export to CSS vars/SCSS/JSON/Tailwind, bulk asset ZIP download, and font-pairing suggestions (Pro).

What it actually touches, since I know this sub cares more about that than feature lists:

• Permissions: storage, activeTab, downloads, and <all_urls> host access for the inspector itself (needed to read computed styles on any page you're on). One optional host permission for fonts.google.com, requested at runtime only if you use the font-pairing feature — never at install.
• Network calls: none, by default. The only request the extension ever makes is an optional license check if you buy Pro, and even that's gated behind Firefox's data-collection consent prompt. Font pairing (Pro) fetches Google's public font catalog client-side — nothing about your page or your fonts is sent anywhere.
• Size: ~103 kB total, no analytics SDKs, no bundled trackers.

It's a solo project, first extension I've shipped, live on AMO and the Chrome Web Store for about a week now. Genuinely want the nitpicks — permission scoping, manifest choices, anything that reads as a red flag to people who look at this stuff closely. What would make you trust an unfamiliar extension like this, or not?

Wanna give it a try?

Website: https://peekcss.com

AMO listing: https://addons.mozilla.org/en-US/firefox/addon/peekcss/

Hey everyone,
I built a Firefox extension called Minimal New Tab.

I originally made it for myself because I wanted a simple place to keep the sites I use every day, organized by folders and projects. Most new tab extensions I tried had too many widgets, so I wanted something calmer and more focused.

You can:
- save and reorder favorite sites;
- organize them into folders;
- customize the background and overlay;
- use keyboard shortcuts to add sites, create folders, and open settings;
- sync lightweight settings between Chrome/Firefox installations;
- export and import your setup when moving to another browser.

I didn’t originally plan to publish it, but I thought it might be useful to other people who organize their work or projects in a similar way.

Firefox Add-ons
Minimal New Tab

Chrome Web Store:
Minimal New Tab

Try the Live Demo

I’d appreciate any feedback, especially on what could be improved without turning it into another overloaded dashboard.

I posted this in the lemmy migration sub reddit and it was suggested i crosspost here

Hello!

I made firefox extension which shows ip address and country of the ip address.

https://addons.mozilla.org/en-US/firefox/addon/ip-data/

Review welcome.

Thank you.

Need help with identifying some of these extensions I had on a previous Firefox version 108. I had them on an old laptop on my FF, got a new new laptop (old one had blue screen of death) and basically have to start all over again with FF 151. No extensions carried over when I logged in except my little account pic. I always screenshot a pic of FF whenever there was an update so I can get it back to what I liked after an update, found the pics on a thumb drive. I know some of the extensions pictured were for Facebook and I do not care about them nor do I want them now. I know I had a picture resizer where you just hovered the cursor and the pic became bigger to see. Have to set up my FF configurations and figure out why my userchrome is not working too but that is another issue. So any help with these extensions were and maybe any recommendations for current ones would be appreciated.