Firefox Articles
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Introducing State Partitioning
State Partitioning is the technical term for a new privacy feature in Firefox called Total Cookie Protection, which will be available in ETP Strict Mode in Firefox 86. This article shows how State Partitioning works inside of Firefox and explains what developers of third-party integrations can do to stay compatible with the latest changes.
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Browser fuzzing at Mozilla
Mozilla has been fuzzing Firefox and its underlying components for a while. It has proven itself to be one of the most efficient ways to identify quality and security issues. In general, we apply fuzzing on different levels: there is fuzzing the browser as a whole but a significant amount of time is also spent on fuzzing isolated code (e.g. with libFuzzer) or even whole components such as the JS engine using separate shells with various fuzzers. For the purpose of this blog post, we will talk specifically about browser fuzzing only, and go into detail on the pipeline we’ve developed.
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January brings us Firefox 85
To wrap up January, we are proud to bring you the release of Firefox 85. In this version we are bringing you support for the :focus-visible pseudo-class in CSS and associated devtools, , and the complete removal of Flash support from Firefox. We’d also like to invite you to preview two exciting new JavaScript features in the current Firefox Nightly — top-level await and relative indexing via the .at() method. Have fun!
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Analyzing Bugzilla Testcases with Bugmon
As a member of Mozilla’s fuzzing team, our job is not only to find bugs, but to do what we can to help get those bugs fixed as quickly as possible. To further reduce the delay in getting these bugs fixed, we wanted to automate as much of this process as possible. This effort resulted in the development of Bugmon; a tool that automates these basic triage tasks for Firefox and SpiderMonkey bugs directly in Bugzilla.
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Porting Firefox to Apple Silicon
The release of Apple Silicon-based Macs at the end of last year generated a flurry of news coverage and some surprises at the machine’s performance. This post details some background information on the experience of porting Firefox to run natively on these CPUs.
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And now for … Firefox 84
As December ushers in the final curtain for this rather eventful year, there is time left for one more Firefox version to be given its wings. Firefox 84 includes some interesting new features including tab order inspection, complex selector support in :not(), the PerformancePaintTiming API, and more!
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Foundations for the Future
This week the Servo project took a significant next step in bringing community-led transformative innovations to the web by announcing it will be hosted by the Linux Foundation. Mozilla is pleased to see Servo, which began as a research effort in 2012, open new doors that can lead it to ever broader benefits for users and the web. Working together, the Servo project and Linux Foundation are a natural fit for nurturing continued growth of the Servo community, encouraging investment in development, and expanding availability and adoption.
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Firefox 83 is upon us
Did November spawn a monster this year? In truth, November has given us a few snippets of good news, far from the least of which is the launch of Firefox 83! In this release we’ve got a few nice additions, including Conical CSS gradients, overflow debugging in the Developer Tools, enabling of WebRender across more platforms, and more besides.
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Warp: Improved JS performance in Firefox 83
With Warp (also called WarpBuilder) we’re making big changes to our JIT (just-in-time) compilers, resulting in improved responsiveness, faster page loads and better memory usage. The new architecture is also more maintainable and unlocks additional SpiderMonkey improvements. This post explains how Warp works and how it made SpiderMonkey faster.
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Coming through with Firefox 82
As October ushers in the tail-end of the year, we are pushing Firefox 82 out the door. This time around we finally enable support for the Media Session API, provide some new CSS pseudo-selector behaviours, close some security loopholes involving the Window.name property, and provide inspection for server-sent events in our developer tools.