31
Using Immutable Caching to Speed Up the Web
The benefits of immutable caching mean that when a page is refreshed, which is an extremely common social media scenario, elements that were previously marked immutable with an HTTP response ...
Mozilla Hacks
Mozilla Hacks is written for web developers, designers and everyone who builds for the Web. Hacks is produced by Mozilla's Developer Relations team and features hundreds of posts from Mozilla ...
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Visit hacks.mozilla.org → RSS feedOn Hacker News May 2010 – May 2026
Web & Frontend 170Software Engineering 69Tools & Productivity 44Systems & Performance 35Tech Industry & Business 31Security & Privacy 19
32
Firefox 79
Firefox 79 offers a new Promise method, more secure target=_blank links, logical assignment operators, tooling improvements for better JavaScript debugging, and many other updates of interest to web developers. In ...
33
Goodbye InnerHTML, Hello SetHTML: Stronger XSS Protection in Firefox 148
Cross-site scripting (XSS) remains one of the most prevalent vulnerabilities on the web. The new standardized Sanitizer API provides a straightforward way for web developers to sanitize untrusted HTML before inserting it into the DOM. Firefox 148 is the first browser to ship this standardized security enhancing API…
34
CSS Grid Level 2 – subgrid is coming to Firefox
The subgrid feature which is part of Level 2 of the CSS Grid Specification is not yet shipping in any browser, but is now available for testing in Firefox Nightly. ...
35
New Developer Tools Features in Firefox 34
A new set of Firefox Developer Tools features has just been uplifted to the Aurora channel. These features are available right now in Aurora, and will be in the Firefox ...
36
An Update on MDN Web Docs
Mozilla announced some general changes in our investments and we would like to outline how they will impact our MDN platform efforts moving forward. It hurts to make these cuts, ...
37
Login Forms Over HTTPS, Please
Update: This feature is now also enabled in Firefox Beta, starting with Firefox Beta 50. Pretty much everyone who uses the web has used a password to log into something. ...
38
Building Firefox's Picture-in-Picture Support
A behind-the-scenes look at the evolution of the Picture-in-Picture player for the Firefox Desktop browser. This feature is now available for MacOS, Linux and Windows users. From the beginning, it's ...
39
What makes WebAssembly fast?
Programming with WebAssembly or JavaScript is not an either/or choice. So developers don’t need to choose between WebAssembly and JavaScript. However, we do expect that developers will swap out parts ...
40
MDN Web Docs evolves: Lowdown on the upcoming new platform
The time has come for Kuma — the platform that powers MDN Web Docs — to evolve. “What does a Kuma evolve into? A KumaMaMa?”
41
Firefox 54: E10S-Multi, WebExtension APIs, CSS Clip-Path
The release of Firefox 54 completes the transformation of Firefox into a fully multi-process browser, running many simultaneous content processes in addition to a UI process and, on Windows, a ...
42
Firefox brings smooth video playback with the fastest AV1 decoder
With this week's release of Firefox 67, the new high performance royalty-free AV1 video decoder dav1d is now enabled by default on all desktop platforms (Windows, OSX and Linux) for ...
43
Firefox moving to 4 week releases
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 ...
44
State Partitioning
State Partitioning is the new privacy feature called Total Cookie Protection, which will be available in ETP Strict Mode in Firefox 86.
45
CSS coding techniques
Lately, we have seen a lot of people struggling with CSS, from beginners to seasoned developers. Some of them don't like the way it works, and wonder if replacing CSS ...
46
Firefox OS devices officially released
Almost two years ago, we announced Boot to Gecko (B2G) here on Mozilla Hacks. We discussed the aims of the project and the work we were planning to do. Today, ...
47
WebAssembly Interface Types: Interoperate with All the Things
People are excited about running WebAssembly outside the browser. People are also excited about running WebAssembly from languages like Python, Ruby, and Rust. Lin Clark's Code Cartoons are back, illustrating ...
48
Retrospective and technical details on the recent Firefox outage
On January 13th 2022, Firefox became unusable for close to two hours for users worldwide. This post highlights the complex series of events and circumstances that, together, triggered a bug deep in the networking code of Firefox.
49
Fluent 1.0: a localization system for natural-sounding translations
Fluent is a family of localization specifications, implementations and good practices developed by Mozilla. With Fluent, translators can create expressive translations that sound great in their language. Today we’re announcing ...
50
Do not let your CDN betray you: Use Subresource Integrity
Mozilla Firefox Developer Edition 43 and other modern browsers help websites to control third-party JavaScript loads and prevent unexpected or malicious modifications. Using a new specification called Subresource Integrity, a ...
51
Compiling to WebAssembly: It’s Happening
WebAssembly is a new binary format for compilation to the web. It is in the process of being designed and implemented as we speak, in collaboration among the major browser ...
52
Introducing TogetherJS
What is TogetherJS? We'd like to introduce TogetherJS, a real-time collaboration tool out of Mozilla Labs. TogetherJS is a service you add to an existing website to add real-time collaboration ...
53
Firebug lives on in Firefox DevTools
Firebug, the original browser developer tool, has been discontinued as a separate Firefox add-on, and will go forward as Firebug.next atop Firefox DevTools. The spirit of Firebug lives on in ...
54
New Firefox Command Line helps you develop faster
Firefox 16, now on the Beta channel, has a fantastic feature that was mentioned briefly in the Aurora 16 blog post and first introduced in a separate post by Joe ...
55
How to Write CSS That Works in Every Browser, Even the Old Ones
Jen Simmons' seven-part mini-series on resilient CSS and how you can create great graphic design on the web, now, and not have to worry about all the old browsers.
56
Twitter Direct Message Caching and Firefox
Distinguished engineer Martin Thomson explains how this problem occurred, the implications for people who might be affected, and how problems of this nature might be avoided in future. To get ...
57
Introducing node-firefox
NOTE: we presented this project last Sunday at FOSDEM, but not everyone could make it to Brussels, so here's a post explaining what node-firefox is and how can it help ...
58
Introducing the Dweb
This is the first post in a series about the distributed/decentralized web, introducing projects that cover social communication, online identity, file sharing, new economic models, as well as high-level application ...
59
MDN Redesign
If you’ve accessed the MDN website today, you probably noticed that it looks quite different.
60
Passwordless authentication: Secure, simple, and fast to deploy
Passwordless is an authentication middleware for Node.js that improves security for your users while being fast and easy to deploy. The last months were very exciting for everyone interested in ...