Worker 内の performance.now() がその Worker の作成時刻を基準とするようになりました (取り消し) | Firefox サイト互換性情報
Firefox 45 以降、Worker 内の performance.now メソッドは、最新の High Resolution Time 仕様に従い、親ウィンドウや親 Worker から継承された ナビゲーション開始時刻 ではなく、その Worker の作成時刻からの DOMHighResTimeStamp を返します。従来のようにメインウィンドウコンテキストに基づくタイムスタンプを得るには、新しい Performance.translateTime メソッドを使ってください。 更新: 仕様がまだ不安定らしいことから、この変更は Firefox 45 Beta サイクル中に 取り消されました。
Developer Edition 47 – User agent emulation, popup debugging and more – Mozilla Hacks - the Web developer blog
Developer Edition 47 – User agent emulation, popup debugging and more This week marks the release of Firefox Developer Edition 47! In recent weeks, we’ve covered the DevTools reload add-on and service worker tooling, so be sure to check out those posts. In this post, we’ll cover the rest of the updates and changes in this Developer Edition release. User Agent emulation We have added the ability to
Making `this` a real binding in SpiderMonkey
Making this a real binding in SpiderMonkey 25 Nov 2015 Mozilla Last week I landed bug 1132183, a pretty large patch rewriting the implementation of this in SpiderMonkey. How this Works In JS In JS, when a function is called, an implicit this argument is passed to it. In strict mode, this inside the function just returns that value: function f() { "use strict"; return this; } f.call(123); // 123 In
Script security - Mozilla | MDN
This is an archived page. It's not actively maintained. Like any web browser, Gecko can load JavaScript from untrusted and potentially hostile web pages and run it on the user's computer. The security model for web content is based on the same-origin policy, in which code gets full access to objects from its origin but highly restricted access to objects from a different origin. The rules for dete
JavaScript Deobfuscator reloaded
A few weeks ago I released JavaScript Deobfuscator 2.0 — finally something that works with current Firefox versions again. Why did it take me a year to fix this compatibility issue? Well, it really wasn’t that simple. After considering all the possibilities I decided that rewriting it from scratch was the only possibility, and that was hard to accomplish in my spare time. Before I continue with th
Firefox JavaScript changelog - JavaScript | MDN
The following is a changelog for JavaScript features in Firefox releases. Firefox 52 New features Support for the async functions has been added. This adds async function, async function expression, and the await keyword (bug 1185106). Implemented ES2017 trailing commas in functions (bug 1303788). Implemented rest parameter destructuring (bug 1243717). The exponentiation operator (**) is now enabl
RemotePageManager - Mozilla | MDN
This is an archived page. It's not actively maintained. One of the challenges of converting Firefox features and add-ons to multiprocess Firefox involves in-content pages. These pages (like about:addons) display in a tab but for now still render in the main process. There can be many reasons for wanting to move these into the content process, particularly if the page interacts with web content in
This API is so Fetching! – Mozilla Hacks - the Web developer blog
For more than a decade the Web has used XMLHttpRequest (XHR) to achieve asynchronous requests in JavaScript. While very useful, XHR is not a very nice API. It suffers from lack of separation of concerns. The input, output and state are all managed by interacting with one object, and state is tracked using events. Also, the event-based model doesn’t play well with JavaScript’s recent focus on Promi
BroadcastChannel API in Firefox 38 – Mozilla Hacks - the Web developer blog
Recently the BroadcastChannel API landed in Firefox 38. This API can be used for simple messaging between browser contexts that have the same user agent and origin. This API is exposed to both Windows and Workers and allows communication between iframes, browser tabs, and worker threads. The intent of the BroadcastChannel API is to provide an API that facilitates communicating simple messages betw
URLUtils.hash (location.hash)とその返す値 - Weblog - Hail2u.net
URLUtilsインターフェイスのブラウザーにおける実装であるLocationオブジェクトのhashプロパティーによりURLのフラグメント識別子(と#)を取得・代入できる。最近のブラウザーは非ASCII文字列もURLエンコードせずに扱えるようになっているが、この辺りの挙動がFirefoxだけ少し違うようだ。それはhashプロパティーの返す値で、常にデコードされた形で返ってくるようになっている。 例えば適当なウェブページで開発者ツール(的なもの)を開き、コンソール(などと呼ばれてるもの)で以下を実行してみる。 > location.hash = '#' + 'あいうえお' < "#あいうえお" > location.hash < "#あいうえお" > location.hash = '#' + encodeURIComponent('あいうえお') < "#%E3%81%82%E3%81%8
GeckoのDOMイベント処理の実装
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Firefox 34でES6構文の ComputedPropertyName が実装された - hogehoge @teramako
924688 - Implement ES6 computed property names また、新しい構文。 オブジェクトリテラル中のプロパティ名部分に式を入れることができる様になる。 今まで var prop = "foo"; var obj = {}; obj[prop] = "FOO Property"; 今までは一旦オブジェクトを作ってから代入するしかなかったものが、 これから var prop = "foo"; var obj = { [prop]: "FOO Property" }; とできるようになる。 プロパティ名の部分に、[expr] と書く。 何が嬉しいの？ まぁ、普通に便利ですね。 と、これだけではアレなのでもう少し書くと、ECMAScript6thになってSymbolという型が登場し特殊なSymbol型のプロパティを定義できるわけだが、このComputedPro
EcmaScript 6 Template Strings
This blog post looks at the implementation of ES6 Template Strings in Mozilla’s SpiderMonkey JavaScript Engine. Template Strings without Substitutions The simplest form of a template string is `hello` Note the back-tick ( ` ) character. That’s just plain boring. It is functionally equivalent to the string literal “hello”. Something a bit more interesting is `hello there` Note that we cannot split
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1000780 - Self-host Function.prototype.bind
1185106 - Implement async functions (ES 2017 proposal)
1084019 - ES6 "name" property of functions should be configurable
FixScroll – Get this Extension for 🦊 Firefox (en-US)
Firefox 36 サイト互換性情報 - Mozilla | MDN
http://rfrn.org/~shu/drafts/ti.pdf
528456 - Implement scoped selectors for querySelector(All)