Firefox Enterprise Is Here. How to Get Its AI Controls Free with policies.json
If you run plain Firefox, at home or on a fleet of laptops managed with a policies.json file, Firefox Enterprise takes nothing away from you. Mozill…
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Web Accessibility with Firefox DevTools: Auditing ARIA, Contrast, and Keyboard Navigation
Web accessibility ensures that websites work for all users — including those using screen readers, keyboard-only navigation, or other assistive tech…
JavaScript Error Handling: Custom Error Types, Result Pattern, Global Handlers, and Error.cause
JavaScript error handling is often an afterthought — a try/catch here and there. But a robust error handling strategy makes the difference between a…
Tab Manager & Session Saver for Firefox: Complete Guide to Named Sessions, Workflows, and Organization
Tab management is one of the most common pain points for browser users. The average knowledge worker has 20+ tabs open at any time; developers and r…
Dark Mode in Firefox: NightOwl vs Dark Reader, OS Integration, about:config, and Scheduling
Dark mode has gone from a niche preference to an expected feature. Firefox users have several options for enabling dark mode — from the OS-level set…
Firefox Picture-in-Picture: Captions, Multiple Videos, Video Calls, and Productivity Workflows
Firefox's Picture-in-Picture (PiP) mode is one of its most useful quality-of-life features — and one of the most underused. It lets you pop any vide…
Vim Keybindings in Firefox: Tridactyl Setup, Configuration, and Workflow
Vimperator, Pentadactyl, and Tridactyl are extensions that bring Vim-style keyboard navigation to Firefox. If you spend most of your time in a termi…
Regex in Firefox: Named Groups, Unicode Support, and DevTools Debugging
Firefox's DevTools include regex testing capabilities, and Firefox's JavaScript engine has some regex-specific features worth knowing for developers…
Testing Security Headers in Firefox: CSP, HSTS, X-Frame-Options, and DevTools Debugging
Security headers are server-side HTTP headers that instruct browsers on security behavior. Firefox implements all the major ones. Here's a practical…
Firefox for Testing and Automation: geckodriver, Playwright, and CI Pipelines
Firefox is an excellent choice for automated testing and web scraping — it has official WebDriver support (geckodriver), a stable API, and unique fe…
about:config Settings Worth Changing (and What Not to Touch)
about:config is Firefox's advanced settings panel — a flat key-value store for hundreds of internal preferences. Most users never touch it. Knowing…
Debugging Service Workers in Firefox: DevTools, about:debugging, and Common Issues
Service workers are a critical web platform feature — they enable offline capabilities, push notifications, and background sync. Firefox has full se…
Firefox vs LibreWolf vs Tor Browser: Choosing the Right Privacy Tool
Three Firefox-based browsers with different privacy postures. Here's an honest breakdown of what each protects against and when to choose each. The…
Customizing Firefox's New Tab Page: From Simple to Full Control
Firefox's new tab page has changed over the years. Here's what you can configure natively, and what extensions exist for more control. Firefox Home…
Firefox vs Chrome for Privacy: What's Actually Different
Firefox vs Chrome for Privacy: What's Actually Different "Firefox is better for privacy" is the standard recommendation, but most guides don't expla…
Firefox about:config Settings Worth Changing (With Explanations)
Firefox about:config Settings Worth Changing (With Explanations) Firefox's about:config page exposes hundreds of hidden settings. Most guides give y…
Firefox Keyboard Shortcuts That Actually Speed Up Your Workflow
Firefox Keyboard Shortcuts That Actually Speed Up Your Workflow Most Firefox shortcut guides cover Ctrl+T (new tab) and Ctrl+W (close tab). Here are…
Firefox Extensions for Researchers and Students (That Don't Require an Account)
Firefox Extensions for Researchers and Students (That Don't Require an Account) Research workflows involve a specific kind of browser chaos: dozens…
I built 10 free Firefox extensions for everyday users — here's what I learned
I've spent the last several months building Firefox extensions focused on everyday users — not developers. Students, remote workers, home users. Peo…
Cookies, которых не видно: partitioned cookies, cookies.txt и одно расширение под три браузера
Бывает так: открываете менеджер cookies, удаляете всё для сайта, перезагружаете страницу — а сайт вас по-прежнему узнаёт. Одна из причин в том, что…
Setting Firefox Bookmark Keywords From an Extension, Without an API for It
I use bookmark keywords all day. Type "jira" in the address bar, hit enter, and you're on the board. Firefox gives a keyword the top "Visit" suggest…
We shipped a proxy extension for Firefox and Edge. Both browsers quietly reuse the old proxy tunnel, and that almost broke it.
We run a pay-as-you-go proxy service. Until this month, using it in a browser meant the manual route: open the proxy settings, type a hostname and p…
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…
Browser Policy Manager: распаковка
В предыдущих публикациях я уже рассказывал, зачем вообще появился Browser Policy Manager, почему я начал с Firefox Enterprise Policies и почему не с…
Ограничения Manifest V3 в расширении EasyProxy для управления прокси
Как перестать искать подходящее расширение и написать его самому. Отличия API Firefox и Chrome Extensions. Читать далее
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…