Senior Software Engineer - Add-Ons

Firefox to add enterprise security tool and AI model choice. Mozilla is building a dedicated enterprise security product for Firefox, letting users choose their AI model and opening its code to outside audit, including by Anthropic. What happened. Mozilla is expanding Firefox's roadmap beyond the browser itself, according to comments from Ajit Varma, the company's Head of Firefox, reported by Diginomica. The browser maker is developing a dedicated enterprise security product, building in the ability for users to choose which AI model powers browser features, and leaning on Firefox's open-source codebase to allow external scrutiny - including, Varma says, an audit by AI firm Anthropic. Varma also referenced an internal initiative codenamed "Dens," though details of its scope were not fully disclosed in the reporting. Separately, he pointed to the impact of the EU's Digital Markets Act (DMA) on mobile browser competition, noting that the regulation has driven around six million users toward Firefox on mobile devices by requiring platform owners to offer genuine browser choice. Why it matters. This is fundamentally a story about trust architecture in AI-enabled software. By opening its codebase to third-party audit and giving users a say in which AI model processes their browsing data, Mozilla is positioning transparency and choice as competitive differentiators rather than afterthoughts - a notable stance as browsers increasingly become AI interfaces, not just rendering engines. For digital transformation leaders, the signal is that AI integration strategy and security/privacy strategy are converging. Enterprises evaluating browsers, or any AI-infused tooling, are likely to weigh not just capability but auditability and model flexibility - factors that open-source and model-agnostic approaches are built to satisfy. By the numbers. * Six million users have reportedly shifted to Firefox on mobile as a result of DMA-mandated browser choice requirements in the EU. The renascence take. Model choice and open-source auditability sound like technical footnotes, but they're really behavioral signals dressed up as architecture decisions. Letting users pick their AI model, and letting outsiders audit the code that runs it, is Mozilla trading a little control for a lot of credibility - and credibility is the scarcest currency in AI right now. Most organisations bolt AI onto their product and ask users to trust the black box; Firefox is betting that visible choice reduces the anxiety that black boxes create, even if most users never exercise that choice. The lesson for service and product teams isn't "open-source everything" - it's that perceived control over an opaque system is often worth more to users than the system's actual performance. If you're shipping AI into a trusted surface like a browser, the real product decision is how much of the machinery you're willing to let people see. This briefing was written by its Newsdesk, synthesising reporting from the outlets below. Follow the links for the original coverage. Questions Renascence get on this topic. According to Ajit Varma, Mozilla's Head of Firefox, the company is developing a dedicated enterprise security product for Firefox, though full details have not yet been disclosed. More in AI Stay ahead of CX Get the signal, not the noise. The stories shaping customer experience - plus the Journal and Experience Loom - in your inbox.

Firefox 157 redesign is here: what's new with tabs, themes and layout. Mozilla's Firefox 157 redesign introduces a more rounded interface, refreshed visual elements, and additional customization options. The update also brings back Compact Mode, which reduces the space used by tabs and browser controls, while new themes and wallpapers give users more ways to personalize Firefox. Published on: 29 Sep 2026, 11:30 am Updated on: 29 Sep 2026, 11:30 am Mozilla is set to give Firefox a noticeable visual overhaul with the release of Firefox 157, bringing softer shapes, rounded tabs, and a more consistent design across desktop and mobile. The update is part of Mozilla's broader effort to refresh the browser without changing its core identity. The new interface uses rounded elements throughout, including the tabs and address bar. Icons, spacing, and colors have also been updated, giving Firefox a more unified appearance across different parts of the browser. Mozilla has described the redesign as a 'renewal' rather than a complete replacement of Firefox's existing design. The company says the changes are intended to modernize the browser while maintaining performance. More themes and personalization. Firefox 157 also gives users more ways to customize the browser. Mozilla has added new themes and wallpaper choices, with the refreshed color palette offering different looks for users who prefer either light or dark interfaces. The redesign is not limited to appearance. Mozilla has also been working on making frequently used tools easier to reach, including tab groups, Split View, and vertical tabs. According to the company, accessibility was considered as part of the redesign, including readability, contrast, focus states, keyboard navigation, and compatibility with different system settings. Compact Mode makes a return. One of the most noticeable additions for long-time Firefox users is the return of Compact Mode. The feature was brought back following requests from the Firefox community. Compact Mode reduces the space taken up by tabs, toolbars, and browser controls, leaving more room for the webpage itself. Mozilla's support documentation confirms that Firefox 157 now lets users enable Compact Mode directly in Settings, rather than relying on the older workaround. The option could be particularly useful on smaller displays or for people who prefer a less crowded browser interface. Firefox continues its broader refresh. The visual redesign follows several other Firefox changes introduced over the past year, including improvements to the homepage, Split View, built-in VPN features, and controls that let users manage or disable Firefox's AI features. Mozilla has also been testing AI-powered browsing features, including Smart Window, as browser makers increasingly add AI tools to their products. At the same time, Firefox continues to offer controls that allow users to decide whether they want AI enhancements enabled. With Firefox 157, Mozilla is therefore changing more than the browser's appearance. The update brings a refreshed visual language, additional personalization, and the return of a long-requested compact layout while keeping the browser's existing focus on user control.

Firefox 157 arrives with Nova redesign, Mozilla's biggest visual overhaul in years and faster video calls. The update introduces a softer interface, restores Compact mode and adds media improvements, while removing Amazon from Firefox's built-in search options. Published 09/30/26 AT 12:14 AM AEST SAN FRANCISCO - Mozilla on Tuesday began rolling out Firefox 157, the first stable version of its web browser to include the company's long-awaited Nova redesign, a sweeping visual overhaul that gives Firefox a softer, rounder and more colorful look. The update also brings hardware-accelerated AV1 video decoding for video calls, fixes for high dynamic range video playback and the removal of Amazon as a built-in search engine option. Firefox 157 binaries first appeared on Mozilla's file servers on Monday, with the official release scheduled for Tuesday, Sept. 29. Most existing installations will update automatically. A new look for Firefox The Nova design marks what Mozilla has described as Firefox's biggest visual refresh in years. The company's Firefox user experience team has said the goal of the redesign is a browser that feels "cleaner, warmer, faster and more adaptable." The redesign changes the appearance of nearly every part of the browser. Tabs now have a softer outline, with a subtle color gradient around the active tab. Panels, menus and settings dialogs feature more consistent rounded corners, and address bars, search boxes and sidebars have also been given a rounder shape. Icons have been refreshed for both light and dark themes, spacing across the interface has been rebalanced, and pastel color tints have been added throughout the browser's frame. Mozilla has also updated areas such as the add-ons manager and theme picker to match the new style. Nova technically appeared in earlier versions of Firefox as an experimental option hidden behind a setting, but Firefox 157 is the first release to turn it on by default for all users. Mozilla has said that once the rollout is complete, it wants people to simply call the browser Firefox again, since Nova refers to the design update itself rather than a separate product. Compact mode returns One of the most notable changes for longtime users is the return of Compact mode, a denser layout that reduces spacing and the size of the browser's frame and borders. The feature had been removed in earlier redesigns, frustrating some users with smaller screens. Firefox 157 offers three density options: Compact, for smaller screens; Standard, with balanced spacing for most displays; and Touch, which features larger interface elements and click targets for touchscreen devices. The redesign also adds new themes, wallpapers and widgets for the New Tab page. It complements other recent changes, including a redesigned Settings page and artwork featuring Firefox's new mascot, Kit. Faster, smoother video calls Beyond the visual changes, Firefox 157 includes several performance and media improvements. For the first time, WebRTC video calls in Firefox can use hardware AV1 decoding on compatible devices, replacing software decoding. AV1 is a modern video format that offers high-quality video at lower bandwidth, but decoding it in software can be demanding. Using the computer's hardware instead should reduce processor load, heat and battery drain during calls on supported systems. The feature builds on Firefox 156, released two weeks earlier, which added hardware H.264 decoding for WebRTC calls on ARM64 devices and made PDF loading up to 45% faster. Firefox 157 also improves HDR video playback and fixes audio and video synchronization problems that could occur when users changed playback speed. On Windows, it addresses an issue where the taskbar could remain visible over fullscreen video. For web developers, the release adds support for detecting browser support of specific CSS at-rules through the @supports at-rule function and adds a chain value for the CSS overscroll-behavior property. Amazon removed as search option Firefox 157 also removes Amazon as a built-in search engine choice. Users who want to search Amazon directly from the address bar can still add it manually. Faster release schedule Firefox 157 is one of the first releases under Mozilla's new two-week release schedule. The company introduced the faster cadence with Firefox 155 earlier this month, saying it wants to deliver completed features and fixes to users more quickly. Firefox had previously followed a four-week release cycle. Alongside Firefox 157, Mozilla planned updates to its extended support releases, including Firefox 140.17 and Firefox 115.42, which are used mainly by businesses and organizations that prefer less frequent feature changes. Mixed reactions The Nova design has drawn mixed reactions during testing. Mozilla first showed mockups of the redesign in March and previewed it in Firefox Nightly builds in July before opening public beta testing on Sept. 14. Some reviewers have praised its modern look, while others have said the rounded buttons and added spacing take up more screen space. Some longtime users have argued Mozilla should focus less on design and more on technical features. The redesign's rounded shapes and gradients have drawn comparisons to Google's Material You design on Android and Apple's Liquid Glass interface on its devices. Mozilla has said it worked with the community to gather feedback and made changes before the broader rollout. The company has indicated that the new style is here to stay. Earlier this year, Mozilla reported page load speed gains of nearly 9% alongside the design goals now reflected in Firefox 157. How to get it Firefox users on desktop will receive the update automatically in the coming days. Those who want it sooner can check for updates manually by opening the browser's "About Firefox" window, which will download and install the latest version. Users who prefer a denser layout can enable Compact mode through the Appearance section of Firefox's settings. Competing in a crowded market The redesign comes as Mozilla seeks to keep Firefox competitive in a browser market dominated by Google's Chrome and Apple's Safari, and increasingly crowded with new AI-focused browsers. Firefox's share of the global browser market has declined over the past decade, and Mozilla has been working to refresh the browser's appeal with new features, design updates and a stronger emphasis on privacy.