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Mozilla is trialing a Firefox Nightly feature called Mini Window that lets users pop a tab or page section into a small, always-on-top window with minimal controls. The window hides the address bar and toolbar until hovered, making the content resemble a standalone web app while staying visible above other Firefox windows.
Mozilla has introduced a beta feature called Mini Window in Firefox Nightly that lets users detach a tab, or part of one, into a small floating window resembling a standalone web app. The Mini Window hides the usual browser interface until the cursor hovers over it, revealing only the address bar and basic navigation controls, and it stays on top of other Firefox windows. The feature is currently available only in the Firefox Nightly build.
Mozilla executive Nabiha Syed discussed efforts including MozFest, fellowships, and a new $500,000 incubator aimed at diversifying an internet increasingly dominated by AI-generated content. The initiatives seek to support projects that push back against what she describes as a growing web monoculture, where studies suggest at least half of online content is now AI-generated.
Researchers report that GLM 5.3, an open-weight AI model released by Z.ai in August, was able to identify and exploit Firefox vulnerabilities during the gap between a security fix being published and reaching users. They found that Firefox versions released between September 17 and October 26 could be compromised this way, with the model building a malicious webpage that silently stole a file from a visitor's computer, at a cost of roughly $1,000 per version. The researchers disclosed the issue to Mozilla, which shipped Firefox 159.0 on October 27, 2026 patching a previously undisclosed vulnerability the model had also used.
Mozilla released Firefox 159 for Windows, MacOS, Linux and Android, fixing 167 security bugs, 108 of them rated high severity, many involving use-after-free memory flaws and sandbox escapes. Google separately issued a Chrome update patching 52 vulnerabilities, including four critical ones. Firefox 159 also adds new features such as a MacOS share picker and sidebar access to saved passwords.
Mozilla has added two new features to Smart Window, its opt-in AI browsing tool in Firefox: AI-powered form filling and website monitoring. The form-filling tool uses Google's Gemini 3.1 Flash Lite model to pull context from other open tabs—such as a portfolio or professional profile—to answer form fields beyond basic autofill data like name and address.
Mozilla is rolling out two new capabilities to Firefox's Smart Window AI browsing beta: a tool that auto-fills web forms using data pulled from a user's open tabs, and a 'watch' feature that monitors specified webpages for changes like sales or job postings. The form-fill feature works on text fields with four or more entries and sends source-page data to Google's Gemini 3.1 Flash Lite model, while the watch feature checks pages daily or weekly and notifies users via the Tasks button or desktop alerts. Both features launch first on desktop in the US and Canada, with wider rollout planned for coming months.
Mozilla is framing a new push for Firefox around restoring qualities associated with the internet's earlier, less corporate-dominated era, according to the report. Details of specific product changes were not fully outlined in the available material, but the effort centers on nostalgia for a more open web experience.
Mozilla says it met with Microsoft to discuss concerns from its 87-page report on how Windows pushes Edge, but found the company unresponsive. Mozilla counsel Kush Amlani points to post-update prompts that set Edge as default and Start menu links that open in Edge outside Europe, contrasting this with EU versions of Windows where such defaults respect user choice due to local law.
Mozilla has introduced Firefox Enterprise, a version of its browser aimed at companies and institutions that need compliance, governance and security controls hosted on their own infrastructure. The offering includes a self-hosted management console allowing administrators to set policies on data access, authentication and AI tool usage, and is being marketed specifically to European organizations. Mozilla says Firefox already has about 200 million monthly users and thousands of organizations deploying custom policies, and this new tier adds paid tools on top of the free, open-source browser.
Mozilla has introduced Firefox Enterprise, a version of its browser aimed at organizations that need centralized management and deployment tools. The offering targets IT administrators who require more control over configuration, updates and security settings across many machines.
Mozilla has released Firefox 158, which turns on support for the JPEG-XL image format by default for users. Previously, JPEG-XL required users to manually enable an experimental flag to view such images in the browser.