Mozilla has released Firefox 155.0, a notable update that brings significant performance improvements, user interface refinements, and numerous bug fixes. The new release also expands the rollout of Smart Window, which is now available to all users in the United States, Canada, and France. This version focuses on speed, smarter organization, and more polished browsing experiences across platforms.
One of the headline improvements in Firefox 155.0 is the speed enhancement to the built-in Assistant. Mozilla reports that common Assistant tasks now complete in roughly one-fifth of the previous time, delivering faster, more responsive help when users need it. The Assistant also uses Exa web search citations to support its answers, helping ensure responses are backed by reliable sources. To improve continuity, Firefox now offers personalized “resume conversation” suggestions so users can quickly return to topics or tasks they were previously exploring.
Firefox 155.0 introduces smarter tab management with an upgraded “Organize Tabs” feature. The browser now suggests more logical groupings of related tabs and assigns clearer, more descriptive names to those groups. This change helps users find and return to relevant tabs faster, reducing clutter and improving workflow efficiency. In addition, the address bar now shows a live count of blocked trackers, giving users clearer insight into privacy protections in real time. For users who prefer a minimal interface, this tracker counter can be hidden from the address bar without disabling the underlying tracking protections.
Gamers receive an important quality-of-life improvement in this release as well. On Windows, Firefox now offers full support for the Nintendo Switch Pro controller and other compatible third-party controllers when playing web games. The directional pads and analog sticks are mapped correctly out of the box, providing a more consistent gaming experience without manual configuration.
Productivity and customization options were also expanded. Users can now reorder Containers within the browser’s settings, making it easier to prioritize and access different browsing contexts, such as work, personal, or shopping profiles. The built-in page translation tool gains new language support with the addition of Marathi and Urdu, broadening accessibility for speakers of those languages.
Beyond new features, Firefox 155.0 addresses a variety of long-standing bugs across multiple platforms. The update fixes an issue that caused text to disappear in Microsoft 365 and other web apps on Linux. It resolves incidents where background live audio streams could suddenly drop out, ensuring more reliable media playback. On MacBooks that feature camera notches, full-screen video letterboxing problems have been corrected so videos display as expected. Other stability and usability fixes include a correction for text selection inside buttons and protections to prevent the browser from freezing during failed tab-drag operations.
Overall, Firefox 155.0 emphasizes speed, better organization, and practical refinements that enhance everyday browsing. Whether you value faster assistant responses, improved privacy visibility, more intuitive tab grouping, broader input device compatibility for web games, or more robust cross-platform stability, this update delivers tangible improvements. Users are encouraged to update to the latest version to benefit from these optimizations and the set of bug fixes designed to make Firefox more reliable and efficient.
If you already use Smart Window or the Assistant, expect a noticeably quicker experience and smoother task recovery with these changes. For those who manage many tabs or rely on Containers, the new grouping suggestions and reordering options should streamline daily workflows. And for multilingual users, expanding translation to Marathi and Urdu makes the web more approachable in those languages.
Mozilla continues to refine Firefox through incremental improvements and platform-specific fixes. Firefox 155.0 demonstrates the project’s continued focus on performance, privacy, and usability, delivering a more polished browser experience across desktop and laptop environments.