Mozilla begins 5% gradual rollout of Firefox 152 ahead of stable release

Mozilla is quietly pushing out Firefox 152 to a random 5% of Android users days before the official launch. The stable release is scheduled for June 16. At least one user noticed their browser updated early without them signing up for any beta testing channels.

A Mozilla employee stepped into a Reddit thread to confirm this is an intentional gradual rollout designed to catch last-minute bugs.

I’m clearly not part of that 5% audience. I checked my devices before this write-up to see if I got the drop, and I’m still sitting on Firefox 151 on both my mobile apps and my desktop version. Most of us will just have to wait until next Tuesday to see the new update hit our devices.

Randomly selecting a small group of users to test an update is a standard move for the industry. It prevents a bad bug from crashing the app for millions of people all at once. The 5% cap keeps the potential damage very contained. If something breaks on a specific device or causes strange graphical glitches, the engineering team can hit the brakes. They can issue a quick patch before the wider June 16 rollout begins for the rest of the world.

This upcoming update doesn’t seem packed with massive visual redesigns. Mozilla is mostly dropping in new developer tools and quiet background changes. They recently fixed hundreds of old bugs using Anthropic’s Mythos AI model and praised the results. Firefox 152 likely contains even more of those under-the-hood security patches and small performance tweaks.

The browser has seen a lot of minor adjustments over the past few weeks to improve daily use. Mozilla just pushed out version 151.0.4 with important stability fixes and an unlimited VPN offer for the summer season.

Meanwhile, they recently made a controversial decision to add Google Play Integrity checks, blocking custom ROM users from accessing certain cloud-based AI features. But one could argue that this is a good thing.

You can check your current version by tapping the settings menu and scrolling down to the About Firefox page. The app will simply update in the background for everyone else once the official Tuesday launch date arrives.

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