Firefox Developer Edition (ach) 151.0

What's new in 151.0

Version 151.0beta, first offered to Beta channel users on April 22, 2026
Firefox Beta gets updated 3 times a week and as a consequence, the release notes for the Beta channel are updated continuously to reflect features that have reached sufficient maturity to benefit from community feedback and bug reports.
Warning: Features listed here may or may not make a final release of Firefox.
In addition to these release notes, you can follow ongoing development via the Firefox Trains website or our @FirefoxBeta Bluesky account.

New

• On macOS, URLs copied from iOS devices using Apple’s Universal Clipboard now paste correctly in Firefox.
• HTML <select> dropdowns now display as an OS-native menu on macOS, aligning their appearance and behavior with the rest of the system.
• The about:translations page is now accessible through the More Tools section of the Application Menu.
• Address Autofill is enabled for users in the Netherlands.
• With Firefox for Android you can now to swipe vertically over the toolbar to quickly see your list of tabs.
• Private Browsing Mode now has a new privacy feature that allows users to instantly clear all data from their current private session without closing the entire browser.
• Standard Enhanced Tracking Protection mode is getting increased protections against fingerprinting that limit the amount of information revealed about your computer and frustrating attempts to track you across websites.
• Local profile backups are now available on macOS and Linux, with support for restoring them across platforms.
• Local network access restrictions are now rolling out to all users. Firefox requires websites to request permission before connecting to devices on your local network or to apps and services on your device. Previously, this protection was limited to users with Enhanced Tracking Protection set to Strict.
• You can now merge multiple PDFs directly in the Firefox PDF viewer.
• Added an AI Controls section to the Firefox for Android Settings for managing AI-enhanced features.
• High dynamic range video is now supported in Firefox on Windows 10 and 11 for HDR displays connected to AMD and NVIDIA GPUs (notably this excludes Intel+NVIDIA laptops for now), work is underway to enable this feature on more GPU vendors. To use this feature you must ensure that HDR mode is enabled for the relevant displays in Windows Settings - Display. …

Full release notes »