Firefox Releases Articles

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  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, advancing a safer web for everyone. We […]

  Posted on February 24, 2026
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  Performance Tool in Firefox DevTools Reloaded

  In Firefox 98, we’re shipping a new version of the existing Performance panel. This panel is now based on the Firefox profiler tool that can be used to capture a performance profile for a web page, inspect visualized performance data and analyze it to identify slow areas.

  Posted on March 30, 2022
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  Time for a review of Firefox 92

  Release time comes around so quickly! This month we have quite a few CSS updates, along with the new Object.hasOwn() static method for JavaScript.

  Posted on September 8, 2021
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  Hopping on Firefox 91

  August is already here, which means so is Firefox 91! For developers, Firefox 91 supports the Visual Viewport API and Intl.DateTimeFormat object additions.

  Posted on August 10, 2021
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  Getting lively with Firefox 90

  As the summer rolls around for those of us in the northern hemisphere, temperatures are high and unwinding with a cool ice tea is high on the agenda. Isn't it lucky then that Background Update is here for Windows, which means Firefox can update even if it's not running. We can just sit back and relax! Also this release we see a few nice JavaScript additions, including private fields and methods for classes, and the at() method for Array, String and TypedArray global objects. This blog post just provides a set of highlights.

  Posted on July 13, 2021
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  Looking fine with Firefox 89

  Firefox 89 has smartened up and brings with it a slimmed-down, slightly more minimalist interface. Along with this new look, we get some great styling features including a force-colours feature for media queries and better control over how fonts are displayed. The long-awaited top-level await keyword for JavaScript modules is now enabled, as well as the PerformanceEventTiming interface, which is another addition to the performance suite of APIs: 89 really has been working out!

  Posted on June 1, 2021
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  Never too late for Firefox 88

  April is upon us, and we have a most timely release for you — Firefox 88. In this release you will find a bunch of nice CSS additions including :user-valid and :user-invalid support and image-set() support, support for regular expression match indices, removal of FTP protocol support for enhanced security, and more! This blog post […]

  Posted on April 19, 2021
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  In March, we see Firefox 87

  Nearing the end of March now, and we have a new version of Firefox ready to deliver some interesting new features to your door. This month, we've got some rather nice DevTools additions in the form of prefers-color-scheme media query emulation and toggling :target pseudo-classes, some very useful additions to editable DOM elements: the beforeinput event and getTargetRanges() method, and some nice security, privacy, and macOS screenreader support updates.

  Posted on March 23, 2021
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  A Fabulous February Firefox — 86!

  Looking into the near distance, we can see the end of February loitering on the horizon, threatening to give way to March at any moment. To keep you engaged until then, we’d like to introduce you to Firefox 86.

  Posted on February 23, 2021
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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!

  Posted on January 26, 2021