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QUIC and HTTP/3 Support now in Firefox Nightly and Beta

tl;dr: Support for QUIC and HTTP/3 is now enabled by default in Firefox Nightly and Firefox Beta. We are planning to start rollout on the release in Firefox Stable Release 88. HTTP/3 will be available by default by the end of May. What is HTTP/3? HTTP/3 is a new version of HTTP (the protocol that powers the Web) that is based on QUIC. HTTP/3 has three...

Eliminating Data Races in Firefox – A Technical Report

We successfully deployed ThreadSanitizer in the Firefox project to eliminate data races in our remaining C/C++ components. In the process, we found several impactful bugs and can safely say that data races are often underestimated in terms of their impact on program correctness. We recommend that all multithreaded C/C++ projects adopt the ThreadSanitizer...

A web testing deep dive: The MDN web testing report

For the last couple of years, we’ve run the MDN Web Developer Needs Assessment (DNA) Report, which aims to highlight the key issues faced by developers building web sites and applications. This has proved to be an invaluable source of data for browser vendors and other organizations to prioritize improvements to the web platform. This year we did a...

MDN localization in March — Tier 1 locales unfrozen, and future plans

Since we last talked about MDN localization, a lot of progress has been made. In this post we’ll talk you through the unfreezing of Tier 1 locales, and the next steps in our plans to stop displaying non-active and unmaintained locales. Tier 1 locales unfrozen! It has been a long time coming, but we’ve finally achieved our goal of unfreezing our Tier...

In March, we see Firefox 87

Nearing the end of March now, and we have a new version of Firefox ready to deliver some interesting new features to your door. This month, we’ve got some rather nice DevTools additions in the form of prefers-color-scheme media query emulation and toggling :target pseudo-classes, some very useful additions to editable DOM elements: the beforeinput event...

How MDN’s site-search works

tl;dr: Periodically, the whole of MDN is built, by our Node code, in a GitHub Action. A Python script bulk-publishes this to Elasticsearch. Our Django server queries the same Elasticsearch via /api/v1/search. The site-search page is a static single-page app that sends XHR requests to the /api/v1/search endpoint. Search results’ sort-order is determined...

Here’s what’s happening with the Firefox Nightly logo

Fox Gate The internet was set on fire (pun intended) this week, by what I’m calling ‘fox gate’, and chances are you might have seen a meme or two about the Firefox logo. Many people were pulling up for a battle royale because they thought we had scrubbed fox imagery from our browser. This is definitely not happening. The logo causing all the stir...

A Fabulous February Firefox — 86!

Looking into the near distance, we can see the end of February loitering on the horizon, threatening to give way to March at any moment. To keep you engaged until then, we’d like to introduce you to Firefox 86. The new version features some interesting and fun new goodies including support for the Intl.DisplayNames object, the :autofill pseudo-class,...

Introducing State Partitioning

State Partitioning is the technical term for a new privacy feature in Firefox called Total Cookie Protection, which will be available in ETP Strict Mode in Firefox 86. This article shows how State Partitioning works inside of Firefox and explains what developers of third-party integrations can do to stay compatible with the latest changes. Web sites...

MDN localization update, February 2021

In our previous post, An update on MDN Web Docs’ localization strategy, we explained our broad strategy for moving forward with allowing translation edits on MDN again. The MDN localization communities are waiting for news of our progress on unfreezing the top-tier locales, and here we are. In this post we’ll look at where we’ve got to so far in 2021,...

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