The JavaScript Specification has a New License – Mozilla Hacks - the Web developer blog

2022/06/27 12 users the Web developer blog

In March of this year, Ecma International accepted a proposal led by Mozilla for a new alternative license. On June 22nd, the first requests to adopt this license were granted to TC39 and applied to the following documents: ECMA-262 (ECMAScript, the official name for JavaScript) and ECMA-402 (the... 続きを読む

無料でウェブページのパフォーマンスを一発可視化できるツール「Firefox Profiler」レビュー

2022/04/11 93 users ウェブページ Firefox ウェブサイト パフォーマンス

Firefoxにはウェブ開発者向けの開発ツールが搭載されています。この開発ツールにウェブサイトのパフォーマンスを可視化できる分析ツール「Firefox Profiler」が追加されていたので、実際に使ってみました。 Performance Tool in Firefox DevTools Reloaded - Mozilla Hacks - the Web developer blog https://hacks.mozi... 続きを読む

WebAssembly and Back Again: Fine-Grained Sandboxing in Firefox 95 – Mozilla Hacks - the Web developer blog

2021/12/06 6 users again the Web developer blog

In Firefox 95, we’re shipping a novel sandboxing technology called RLBox — developed in collaboration with researchers at the University of California San Diego and the University of Texas — that makes it easy and efficient to isolate subcomponents to make the browser more secure. This technology... 続きを読む

Firefox 93に搭載された「タブのアンロード機能」はどのように動作するのか？

2021/10/06 9 users Mozilla タブ メモリ領域 ソフトウェアエンジニア 機能

2021年10月5日にリリースされた「Firefox 93」には、システムの使用可能メモリが残り少ないときに自動的にタブをアンロードしてメモリ領域を解放する機能が追加されました。この機能の詳細をMozillaのソフトウェアエンジニアであるHaik Aftandilian氏が解説しています。 Tab Unloading in Firefox 93 - Mozilla Hacks - ... 続きを読む

How MDN's autocomplete search works - Mozilla Hacks - the Web developer blog

2021/08/03 10 users the Web developer blog

Last month, Gregor Weber and I added an autocomplete search to MDN Web Docs, that allows you to quickly jump straight to the document you’re looking for by typing parts of the document title. This is the story about how that’s implemented. If you stick around to the end, I’ll share an “easter egg... 続きを読む

HTTP/3が5月末までにFirefoxでデフォルトで有効になる予定、Mozillaが明らかに。QUICの実装はRustによる独自実装の「Neqo」（たぶん「ネコ」） － Publickey

2021/04/26 25 users Publickey rust quic http デフォルト

Mozillaのブログ「Mozilla Hacks」に4月16日付けで投稿された記事「QUIC and HTTP/3 Support now in Firefox Nightly and Beta」によると、5月末までにFirefoxでHTTP/3が利用可能になることが明らかにされました。 FirefoxでのHTTP/3対応について、次のように説明されています。 Support for QUIC and HTTP/3 is now ena... 続きを読む

Warp: Improved JS performance in Firefox 83 - Mozilla Hacks - the Web developer blog

2020/11/14 10 users Warp Just-in-time Firefox Web

Introduction We have enabled Warp, a significant update to SpiderMonkey, by default in Firefox 83. SpiderMonkey is the JavaScript engine used in the Firefox web browser. With Warp (also called WarpBuilder) we’re making big changes to our JIT (just-in-time) compilers, resulting in improved respons... 続きを読む

Twitter Direct Message Caching and Firefox - Mozilla Hacks - the Web developer blog

2020/04/04 5 users the Web developer blog

Twitter is telling its users that their personal direct messages might be stored in Firefox’s web cache. This problem affects anyone who uses Twitter on Firefox from a shared computer account. Those users should clear their cache. This post explains how this problem occurred, what the implication... 続きを読む

Announcing the Bytecode Alliance: Building a secure by default, composable future for WebAssembly - Mozilla Hacks - the Web developer blog

2019/11/12 26 users the Web developer blog

Today we announce the formation of the Bytecode Alliance, a new industry partnership coming together to forge WebAssembly’s outside-the-browser future by collaborating on implementing standards and proposing new ones. Our founding members are Mozilla, Fastly, Intel, and Red Hat, and we’re looking... 続きを読む

Firefox's New WebSocket Inspector - Mozilla Hacks - the Web developer blog

2019/10/15 16 users the Web developer blog

The Firefox DevTools team and our contributors were hard at work over the summer, getting Firefox 70 jam-packed with improvements. We are especially excited about our new WebSocket inspection feature, because you told us in feedback how important it would be for your daily work. To use the inspec... 続きを読む

Moving Firefox to a faster 4-week release cycle - Mozilla Hacks - the Web developer blog

2019/09/17 15 users the Web developer blog

Overview We typically ship a major Firefox browser (Desktop and Android) release every 6 to 8 weeks. Building and releasing a browser is complicated and involves many players. To optimize the process, and make it more reliable for all users, over the years we’ve developed a phased release strateg... 続きを読む

WebAssembly Interface Types: Interoperate with All the Things! - Mozilla Hacks - the Web developer blog

2019/08/21 23 users the Web developer blog

People are excited about running WebAssembly outside the browser. That excitement isn’t just about WebAssembly running in its own standalone runtime. People are also excited about running WebAssembly from languages like Python, Ruby, and Rust. Why would you want to do that? A few reasons: Make “n... 続きを読む

CSS Scroll Snap Updated in Firefox 68 - Mozilla Hacks - the Web developer blog

2019/06/19 7 users the Web developer blog

When Firefox 68 goes to general release next month, it will ship with an updated CSS Scroll Snap specification. This means that Firefox will support the same version of the specification as Chrome and Safari. Scroll snapping will work in the same way across all browsers that implement it. In this... 続きを読む

Firefox brings you smooth video playback with the world's fastest AV1 decoder - Mozilla Hacks - the Web developer blog

2019/05/24 19 users decoder

Tuesday’s release of Firefox 67 brought a number of performance enhancing features that make this our fastest browser ever.  Among these is the high performance, royalty free AV1 video decoder dav1d, now enabled by default on all desktop platforms (Windows, OSX and Linux) for both 32-bit and 64-b... 続きを読む

Firefox 67: Dark Mode CSS, WebRender, and more - Mozilla Hacks - the Web developer blog

2019/05/22 14 users WebRender and more Firefox 67

Firefox 67 is available today, bringing a faster and better JavaScript debugger, support for CSS prefers-color-scheme media queries, and the initial debut of WebRender in stable Firefox. These are just the highlights. For complete information, see: Firefox 67 Release Notes Firefox 67 for Develope... 続きを読む

Faster smarter JavaScript debugging in Firefox DevTools - Mozilla Hacks - the Web developer blog

2019/05/16 19 users the Web developer blog

Script debugging is one of the most powerful and complex productivity features in the web developer toolbox. Done right, it empowers developers to fix bugs quickly and efficiently. So the question for us, the Firefox DevTools team, has been, are the Firefox DevTools doing it right? We’ve been lis... 続きを読む

Technical Details on the Recent Firefox Add-on Outage - Mozilla Hacks - the Web developer blog

2019/05/09 11 users the Web developer blog

Recently, Firefox had an incident in which most add-ons stopped working. This was due to an error on our end: we let one of the certificates used to sign add-ons expire which had the effect of disabling the vast majority of add-ons. Now that we’ve fixed the problem for most users and most people’... 続きを読む

PythonインタプリタをWebAssemblyへコンパイル、Webブラウザで稼働するPython環境「Pyodide」。Mozillaが開発中 － Publickey

2019/04/18 165 users Publickey WebAssembly Pyodide

Mozillaは、WebブラウザでPythonインタプリタや数値計算ライブラリのNumPyなど、Pythonの標準的なデータサイエンス環境をほぼそのまま実行可能にする「Pyodide」（パイオダイドと発音されているようです）を開発中です。 Mozilla Hacksのブログに投稿された記事「Pyodide: Bringing the scientific Python stack to the ... 続きを読む

Pyodide: Bringing the scientific Python stack to the browser - Mozilla Hacks - the Web developer blog

2019/04/17 23 users Pyodide bringing the

Pyodide is an experimental project from Mozilla to create a full Python data science stack that runs entirely in the browser. The impetus for Pyodide came from working on another Mozilla project, Iodide, which we presented in an earlier post.  Iodide is a tool for data science experimentation and... 続きを読む

Standardizing WASI: A system interface to run WebAssembly outside the web – Mozilla Hacks – the Web developer blog

2019/03/27 54 users the Web developer blog

Today, we announce the start of a new standardization effort — WASI, the WebAssembly system interface. Why: Developers are starting to push WebAssembly beyond the browser, because it provides a fast, scalable, secure way to run the same code across all machines. But we don’t yet have a solid foun... 続きを読む

Fast, Bump-Allocated Virtual DOMs with Rust and Wasm – Mozilla Hacks – the Web developer blog

2019/03/14 27 users Fast the Web developer blog

Dodrio is a virtual DOM library written in Rust and WebAssembly. It takes advantage of both Wasm’s linear memory and Rust’s low-level control by designing virtual DOM rendering around bump allocation. Preliminary benchmark results suggest it has best-in-class performance. Background Dodrio from a... 続きを読む

Fearless Security: Thread Safety - Mozilla Hacks - the Web developer blog

2019/02/14 7 users the Web developer blog

In Part 2 of my three-part Fearless Security series, I’ll explore thread safety. Today’s applications are multi-threaded—instead of sequentially completing tasks, a program uses threads to perform multiple tasks simultaneously. We all use concurrency and parallelism every day: Web sites serve mul... 続きを読む

Firefox 65: WebP support, Flexbox Inspector, new tooling & platform updates - Mozilla Hacks - the Web developer blog

2019/01/29 25 users new tooling Firefox 65

Well now, there’s no better way to usher out the first month of the year than with a great new Firefox release. It’s winter for many of us, but that means more at-home time to install Firefox version 65, and check out some of the great new browser and web platform features we’ve included within. ... 続きを読む

Firefox 63 - Tricks and Treats! - Mozilla Hacks - the Web developer blog

2018/10/24 9 users the Web developer blog

It’s that time of the year again- when we put on costumes and pass out goodies to all. It’s Firefox release week! Join me for a spook-tacular1 look at the latest goodies shipping this release. Web Components, Oh My! After a rather long gestation, I’m pleased to announce that support for modern We... 続きを読む

WebAssembly's post-MVP future: A cartoon skill tree - Mozilla Hacks - the Web developer blog

2018/10/22 53 users the Web developer blog

People have a misconception about WebAssembly. They think that the WebAssembly that landed in browsers back in 2017—which we called the minimum viable product (or MVP) of WebAssembly—is the final version of WebAssembly. I can understand where that misconception comes from. The WebAssembly communi... 続きを読む