Mozilla has released the Firefox 155 binaries to the public , an update that comes with more features than usual. Although the official announcement is expected in a few hours, the files can already be downloaded, and the changelog is quite extensive. The company has aimed to boost both loading speed and user experience, while also keeping developers in mind.
The first thing that stands out is that this version isn't just a minor tweak. There's a clear focus on optimizing internet connectivity , an introduction to desktop AI, and a good number of long-awaited bug fixes . Let's break down the highlights of this release.
For those wondering why Firefox 155 is arriving so soon after Firefox 154 , the answer is that Mozilla has changed its schedule and will release major versions every two weeks starting with today's release.
A smarter, faster connection in Firefox 155
The highlight is undoubtedly the new connection selection system. Firefox 155 introduces the third generation of Happy Eyeballs , a mechanism now capable of testing multiple routes simultaneously. It no longer simply compares IPv4 and IPv6, but also utilizes modern DNS records to determine which protocols the server supports and run simultaneous tests with HTTP/2 and HTTP/3 . The idea is for the browser to use the first available option, avoiding unnecessary delays when one route is slower or blocked. In practice, this can be noticeable on pages that previously took a little longer to load.
Related to this, the new version incorporates support for QUIC v2 in HTTP/3 connections. It doesn't force it, but rather uses it when the server chooses it during the handshake. This allows browsing to remain compatible with older infrastructures while taking advantage of the improvements of this protocol when available. It's another step towards smoother web loading, especially on congested networks.
AI makes its way to the desktop in Firefox 155
Another new feature that's generating buzz is Smart Window ( activate it on Linux ), an optional AI-powered navigation window. Currently available to users in the United States, Canada, and France, this feature allows access to open tabs and browsing history, but only with the user's explicit permission . It's a way to give the browser a more active role in organizing information, although it remains to be seen how well it adapts to individual browsing habits. The good news is that it's optional, so those who don't want to use it don't have to activate it.
Corrections and updates for everyday use
The update also includes a fix for a problem affecting Linux users . Apparently, the system wasn't going into sleep mode after a long browsing session, which could drain the battery unnecessarily. With this patch, the system should now function normally. In addition, the ability to reorder containers directly from the settings has been added, a feature many users have been requesting for some time.
In the privacy section, Firefox 155 now displays the following in the address bar: number of trackers it has blockedIt's a quick and visual way to see what the browser is doing. Link opening has also been restricted. mailto: so that they only execute when the user explicitly clicks, preventing surprises. And for those who play with a controller, there's a surprise: support for the Nintendo Switch Pro Controller and other compatible systems in Windows.
A feast for developers
Developers also have reason to be happy. Firefox 155 includes support for WebAssembly Compact Import Section and for WebAssembly Wide Arithmetic, which allows working with 128-bit arithmetic instructions. In the realm of CSS, the property has been standardized. font-width as the official name of font-stretch, and support has been added for the function progress(). The WebRTC interoperability It has also improved, which should translate into more stable calls and video calls within the browser.
With this mix of network optimizations, optional AI features, and a good number of developer tweaks, Firefox 155 stands out as one of the most comprehensive updates in recent memory. Intelligent route selection and QUIC v2 support aim to maximize connection speed, while the AI-powered window and interface changes strive to make browsing smoother and more seamless. It's definitely a version worth trying.