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Mozilla: Rust, JS, CSS, and Secret Firefox Tips

Submitted by Roy Schestowitz on Tuesday 8th of June 2021 10:18:15 PM Filed under
Moz/FF
  • Announcing Rustup 1.24.3

    The rustup working group is happy to announce the release of rustup version 1.24.3. Rustup is the recommended tool to install Rust, a programming language that is empowering everyone to build reliable and efficient software.

  • Implementing Private Fields for JavaScript

    When implementing a language feature for JavaScript, an implementer must make decisions about how the language in the specification maps to the implementation. Sometimes this is fairly simple, where the specification and implementation can share much of the same terminology and algorithms. Other times, pressures in the implementation make it more challenging, requiring or pressuring the implementation strategy diverge to diverge from the language specification.

    Private fields is an example of where the specification language and implementation reality diverge, at least in SpiderMonkey– the JavaScript engine which powers Firefox. To understand more, I’ll explain what private fields are, a couple of models for thinking about them, and explain why our implementation diverges from the specification language.

    [...]

    The most basic mental model one can have for private fields is what it says on the tin: fields, but private. Now, JS fields become properties on objects, so the mental model is perhaps ‘properties that can’t be accessed from outside the class’.

    However, when we encounter proxies, this mental model breaks down a bit; trying to specify the semantics for ‘hidden properties’ and proxies is challenging (what happens when a Proxy is trying to provide access control to properties, if you aren’t supposed to be able see private fields with Proxies? Can subclasses access private fields? Do private fields participate in prototype inheritance?) . In order to preserve the desired privacy properties an alternative mental model became the way the committee thinks about private fields.

  • Dennis Schubert: WebCompat Tale: CSS Flexbox and the order of things

    Have you thought about the order of things recently? Purely from a web development perspective, I mean.

    The chances are that you, just like me, usually don’t spend too much time thinking about the drawing order of elements on your site when writing HTML and CSS. And that’s generally fine because things usually just feel right.

  • 11 secret tips for Firefox that will make you an internet pro

    With Firefox, getting around the internet is fast, straight-forward and easy. Now you can go beyond the basics with these secret and not-so-secret tricks that make your internetting experience even more fun. Read on for some of our favorite Firefox features that you may not know about… yet.

    [...]

    Tab hoarders, we see you. Heck, we are you. Don’t ever let anyone shame you for having dozens (and dozens3) of open tabs, implying you don’t have it together and can’t find the right one. Instead, dazzle them with this trick. Add a % sign to your URL search to search specifically through all your open tabs, including tabs in different windows. Then you can click over to the already open tab instead of creating a duplicate, not that anyone has ever done that.

»

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