Some SpiderMonkey optimizations in Firefox Quantum
A few weeks ago we released Firefox 57, also known as Firefox Quantum. I work on SpiderMonkey performance and this year I spent a lot of time analyzing profiles and optimizing as many things as possible. I can't go through all SpiderMonkey performance improvements here: this year alone I landed almost 500 patches (most of them performance related, most of them pretty boring) and other SpiderMonkey
授業でFirefoxにコントリビュートした話 - /entry/yyyy/MM/dd/:id
本記事は東京大学工学部電子情報工学科の「大規模ソフトウェアを手探る」という実験の報告記事です 学校の授業でOSSにコントリビュート？ 東京大学工学部電子情報工学科にはあらゆる工学系学科の例に漏れず「実験」の授業があります。 実験の内容はいくつかのテーマの中から選択することができ、例えば 「OpenCV/OpenGLによる映像処理」 「情報可視化技術とデータ解析」 「AIロボットを作ろう」 などのテーマが用意されています。 私はその中から 「大規模ソフトウェアを手探る」 というものを選択し、 その結果としてFirefoxのJavaScriptエンジンである SpiderMonkeyにコントリビュートすることができました。 コミットログ1(私の名前のコミット): https://hg.mozilla.org/mozilla-central/rev/7371550c7fc5 コミットログ2(ペア
GitHub - CCharlieLi/bookmark-parser: Find and parse Firefox/Chrome bookmark HTML and jsonlz4 file into useable JSON object or export as JSON file.
const BMParser = require('bookmark-parser'); // Read from (NETSCAPE/Firefox) bookmark HTML file BMParser.readFromHTMLFile(htmlFilePath) .then(res => { ... }); // Read from (NETSCAPE/Firefox) bookmark HTML file and export BMParser.readFromHTMLFile(htmlFilePath, exportFilePath) .then(res => { ... }); // Read from (NETSCAPE/Firefox) bookmark HTML readStream BMParser.readFromHTMLReadStream(readStream)
Investigating Performance of Object#toString in ES2015
A relevant ad will be displayed here soon. These ads help pay for my hosting. Please consider disabling your ad blocker on Pony Foo. These ads help pay for my hosting. In this article, we’ll discuss how Object.prototype.toString() performs in the V8 engine, why it’s important, how it changed with the introduction of ES2015 symbols, and how the baseline performance can be improved by up to 6x (base
Performance best practices for Firefox front-end engineers — Firefox Source Docs documentation
Overview A Glossary of Common Terms A Quick Guide to Mozilla Applications Getting Started Getting Set Up To Work On The Firefox Codebase Working On Firefox Working on Firefox Bug Handling Firefox User Guide Firefox DevTools User Docs Source Code Documentation Governance Firefox Front-end DOM Editor Style system (CSS) & Layout Graphics Processes, Threads and IPC Firefox DevTools Contributor Docs To
Firefox 52 setTimeout() Changes
Firefox 52 hit the release channel last week and it includes a few changes to setTimeout() and setInterval(). In particular, we have changed how we schedule and execute timer callbacks in order to reduce the possibility of jank. To start, consider the following simple demo site (you may not want to run it yourself): Demo Site When you click the “Start” button the site will begin flooding the brows
ECMAScript 2016+ in Firefox
After the release of ECMAScript 2015, a.k.a. ES6, the ECMAScript Language Specification is evolving rapidly: it’s getting many new features that will help developing web applications, with a new release planned every year. Last week, Firefox Nightly 54 reached 100% on the Kangax ECMAScript 2016+ compatibility table that currently covers ECMAScript 2016 and the ECMAScript 2017 draft. Here are some
event.timeStamp が初期設定で DOMHighResTimeStamp を返すようになりました | Firefox サイト互換性情報
Firefox 54 以降、すべての Firefox チャンネルおよびプラットフォーム上で、Event.prototype.timeStamp プロパティは、エポック時間からのミリ秒単位でしかなかった整数型 DOMTimeStamp 値に代わり、整数部にミリ秒、小数部にマイクロ秒を含む、ページ読み込み からの浮動小数点数型 DOMHighResTimeStamp 値を返します。 この変更は、Windows、Linux、macOS 版の Firefox Nightly と Developer Edition では既に行われています。Android での実装も完了したことから、Beta、Release 両チャンネルでも初期設定で高精度タイムスタンプが有効となります。 Google Chrome では 2016 年 3 月公開の Chrome 49 以降有効になっていることから、現時点での互換性
CacheIR: A new approach to Inline Caching in Firefox
The past months we have been working on CacheIR, an overhaul of the IC code in SpiderMonkey's JITs. CacheIR has allowed us to remove thousands of lines of boilerplate and code duplication. It has also made it much easier to add new optimizations. This post describes how CacheIR works, why it's much better than what we had before, and some plans we have for the future. IC stubs Both the Baseline JI
async/await support in Firefox – Firefox Nightly News
Support for async/await has been added in the Nightly build from the 31st of October (bug #1185106). Great stuff! Time to start removing those JavaScript transpilers from your experimental projects, and testing native browser support 😉 Here’s a demo. If your browser supports async/await natively, you will see “YES”.
Performance — Firefox Source Docs documentation
Overview A Glossary of Common Terms A Quick Guide to Mozilla Applications Getting Started Getting Set Up To Work On The Firefox Codebase Working On Firefox Working on Firefox Bug Handling Firefox User Guide Firefox DevTools User Docs Source Code Documentation Governance Firefox Front-end DOM Editor Style system (CSS) & Layout Graphics Processes, Threads and IPC Firefox DevTools Contributor Docs To
Animating like you just don’t care with Element.animate – Mozilla Hacks - the Web developer blog
In Firefox 48 we’re shipping the <a href="https://developer.mozilla.org/docs/Web/API/Element/animate" target="_blank"><b>Element.animate()</b></a> API — a new way to programmatically animate DOM elements using JavaScript. Let’s pause for a second — “big deal”, you might say, or “what’s all the fuss about?” After all, there are already plenty of animation libraries to choose from. In this post I wa
IonMonkey: Evil on your behalf
“Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered.” — Donald Knuth This quote is not as well known as the end of it, often shortened to “premature optimization is the root of all evil”. It highlights why
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568953 - (harmony:modules) [meta] ES6 modules
GitHub - mozilla/qbrt: CLI to a Gecko desktop app runtime
GitHub - mozilla/dispensary: Hashes of popular JavaScript libraries, mainly for the Mozilla's addons-linter
Intent to implement and ship: self.origin
1287706 - Support "once" option for addEventListener
JavaScript エラーを簡単に調べられるようになりました
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