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Firefox is Mozilla's open-source web browser built on the Gecko engine, available on desktop and mobile and known for privacy features and extensions.
Mozilla announced Firefox Enterprise on October 12 without a price for its self-hosted management console. A DEV Community review says its AI lockdown already works in free Firefox through the AIControls policy.
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Mozilla launched Firefox Enterprise on October 12, 2026, with a browser management console that customers run on their own infrastructure. Policy, DLP and AI-use controls live on that server, so the customer also deploys, patches and backs it up.
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Firefox 155 and Safari 27 completed engine support for CSS alpha(), progress() and revert-rule, dev.to reports. Teams can fold opacity variants into one call, though Baseline covers only the latest browser versions.
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Portrait MP4 clips decoded with mp4box.js and VideoDecoder came out 1920x1080 and sideways in Chromium, Chrome, Firefox and WebKit, a dev.to post reports. The rotation lives in the track header matrix that the demuxer exposes, so the app has to read it and turn the canvas itself.
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Socket found 16 Firefox extensions posing as Rabby and OKX wallets that intercept recovery phrases and private keys during wallet import. Names and IDs rotated behind a screen that still read Rabby Wallet, so only an allowlist of exact extension IDs holds up.
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CSS text-box-trim crops a headline's box to the font's cap height and baseline, replacing negative margins like -0.18em tuned by eye in devtools. The browser takes the numbers from the font file, so swapping the typeface or raising line-height no longer means retuning a margin.
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PNG-8 at 124 colors encoded a red-text test poster in 48,481 bytes at an edge error of 0.13 Delta E, smaller and cleaner than every JPEG export. For flat graphics like this one, an export tool that converts everything to JPEG ships bigger files with dirtier red text.
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Firefox 157 rolls out Mozilla's redesign, trialled for months in Nightly, to everyone on desktop and mobile. Help screenshots and walkthroughs made before this release no longer match what an updated user sees.
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VUSec disclosed Branch Target Reuse, a Spectre-v2 attack on JIT engines whose Linux exploit leaks memory at 8 bytes a second. It bypassed every enabled mitigation, and the kernel's fix had already shipped in July.
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Chromium 149 canvas JPEGs grew 2.25x from quality 0.80 to 0.99 while red-text edge error fell only from 8.11 to 6.35, one developer measured. Firefox drops chroma subsampling at a lower setting, so the reviewer's browser decides whether the fringe shows.
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Intel, AMD and Arm say their IBPB barrier can block Branch Target Reuse, a Spectre v2 variant hitting all three, if JIT software calls it. Each kernel, browser and runtime that rewrites JIT code now has to add that call itself.
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Firefox's Exa-powered assistant appears only to users who switch it on, a wager that restraint sells where default-on assistants have not.
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Firefox's AI assistant is out of North America for the first time, and in French. Mistral's announcement says the browser is now powered by its models; Mozilla says it added one option among several.
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TC39's iterator helpers are Baseline as of September 2026, so lazy chains run without a polyfill from Chrome 122 and Node 22 upward, while the teams reporting the 40-60% memory saving attached to them are unnamed.
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The add-on shipped to Mozilla's store as a dispatcher and took its instructions afterwards from a page it opened itself, on a domain built to resemble googleusercontent.com.
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Anthropic says Claude Mythos Preview found and exploited previously unknown flaws in every major operating system and web browser during a month of testing. Its disclosure process keeps the rest unnamed until patches ship.
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The packaged firejail profile allows a Mozilla directory that Firefox stopped using at version 150, so a jail that looks hardened opens a fresh empty browser every launch, ad blocker included in the loss.
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The September 16 partnership gives Firefox's beta assistant retrieval with sources, tab grouping and history previews, and each request only sees the tabs and history you grant it. Beta coverage is the US, Canada and France.
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The year's CVE tally has reached 66,401, close to double where it stood last September, and Microsoft alone patched 974 in a single month. Jerry Gamblin, who keeps the count, says more known bugs is mostly the system working.
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A single test on a Display P3 photo found the stripped copy looked duller with every pixel value unchanged, and re-saving at quality 100 recovered nothing; the frame mean moved under 3 ΔE while the most saturated pixels moved 5.4.
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Build · September 16, 2026 · Confirmed6 publishers
Invest · August 20, 2026 · Confirmed2 publishers