Inaudible sounds used to fingerprint browsers catch AliExpress red-handed
Is the technique outdated? Yes. Is it still creepy? Also yes.
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GreaseMonkey, or How to Enhance Your Web Experience (2008)
Archival repost — originally published on my old blog on December 21, 2008. Lightly cleaned up for dev.to (translated from French, and I fixed a sma…
Mozilla adopted my Firefox DevTools MCP, but I didn't build it to browse the web
A little while ago I wrote an MCP server that lets an AI agent inspect and control Firefox through the Remote Debugging Protocol. It got adopted int…
Fullscreen icon RTL language support in Firefox browser
Our target is to make sure that when the firefox browser is set to RTL mode the fullscreen icon flips as well to follow suite. Introduction When Fir…
Writing unit test for Firefox private browsing window
Our indicator looks like this: an icon + a label. The browser has an indicator for when a user is in private mode. The indicator lives in two places…
I gave your agent access to Firefox - meet Firefox CLI
Firefox CLI is my new project - a CLI interface that lets your agent control your real Firefox session. It's a full equivalent of Agent Browser with…
I Built a Free Firefox New Tab Extension with Live Weather and World Clocks
I spent a few weekends building a Firefox browser extension because I was tired of my new tab page doing absolutely nothing useful. The result: Weat…
Mozilla says 271 vulnerabilities found by Mythos have "almost no false positives"
The developer of Firefox says it has "completely bought in" on AI-assisted bug discovery.
How to Use the OpenWeatherMap API in a Firefox Extension
How to Use the OpenWeatherMap API in a Firefox Extension Weather data is one of the most commonly requested features in new tab extensions. The Weat…
Firefox Extension Manifest V3 vs V2: What Actually Changed
Firefox Extension Manifest V3 vs V2: What Actually Changed If you've been following Chrome's controversial Manifest V3 migration, you might be wonde…
Handling Offline Mode in Firefox Browser Extensions
Handling Offline Mode in Firefox Browser Extensions When building extensions that depend on network data — like my Weather & Clock Dashboard — o…
How I Automated Firefox Extension Screenshots for AMO Listings
How I Automated Firefox Extension Screenshots for AMO Listings One of the most tedious parts of publishing to Mozilla's Add-On Observatory (AMO) is…
Firefox Extension Icons: Sizes, Formats, and SVG vs PNG
Firefox Extension Icons: Sizes, Formats, and SVG vs PNG The icon is the first thing users see in AMO search results and the add-ons bar. Getting it…
AMO Review Process: What Happens After You Submit a Firefox Extension
AMO Review Process: What Happens After You Submit a Firefox Extension Submitting a Firefox extension to addons.mozilla.org (AMO) is the end of devel…
Internationalizing a Firefox Extension: i18n Without a Library
Internationalizing a Firefox Extension: i18n Without a Library Firefox extensions have a built-in i18n system that covers most use cases without any…
Performance Tips for Firefox New Tab Extensions: Sub-100ms Load Times
Performance Tips for Firefox New Tab Extensions: Sub-100ms Load Times Every time someone opens a new tab, your extension loads. If it's slow, they'l…
Keyboard Shortcuts in Firefox Extensions: A Complete Guide
Keyboard Shortcuts in Firefox Extensions: A Complete Guide Good keyboard support separates a great extension from a mediocre one. Here's everything…
Search Bar in a Firefox New Tab Extension: Which Engine, How to Handle
Search Bar in a Firefox New Tab Extension: Which Engine, How to Handle Adding a search bar to a new tab extension sounds simple — it's just a text i…
Dark Mode in Firefox Extensions: Respecting System Preferences
Dark Mode in Firefox Extensions: Respecting System Preferences Firefox users who prefer dark mode shouldn't have to manually toggle it in every exte…
Responsive Grid Layouts for Browser Extension New Tab Pages
Responsive Grid Layouts for Browser Extension New Tab Pages When building the Weather & Clock Dashboard Firefox extension, one of the tricky cha…
Auto-Detecting Location in a Firefox Extension Without Asking for GPS
Auto-Detecting Location Without Asking for GPS For the Weather & Clock Dashboard Firefox extension, I needed the user's city without requiring t…
Making a Firefox Extension Work Offline — Service Workers vs. Cache API
Making a Firefox Extension Work Offline — Service Workers vs. Cache API A common question when building browser extensions: how do you handle offlin…
Building Privacy-First Browser Extensions: What I Learned
When I built Weather & Clock Dashboard for Firefox, I made a decision early on: no analytics, no accounts, no external calls except weather data…
5 Firefox New Tab Extensions Compared: Which One Actually Improves Your Workflow?
Your browser opens dozens of times per day. Each time, you see the new tab page for a split second — maybe less. That's hundreds of micro-moments th…
The New Tab Page Is Prime Real Estate. Are You Wasting It?
The New Tab Page Is Prime Real Estate. Are You Wasting It? You open a new browser tab dozens of times a day. Most people see either a blank white pa…
5 Ways Firefox Extension New Tab Pages Are Killing Your Browser Performance
The Hidden Performance Cost of New Tab Extensions You install a new tab extension to make your browser nicer. You get weather, a clock, a background…