Mozilla launched Firefox 151 on June 7, introducing several new features focused on video, privacy, and user data management [1, 2].
The update debuts a Document Picture-in-Picture API that allows always-on-top windows displaying arbitrary HTML content. This offers enhanced controls for video conferencing and other media workflows beyond standard video playback [1]. Firefox's built-in VPN also saw improvements with finer control over the displayed apparent location to better protect user privacy [1, 2].
Private browsing received an upgrade enabling users to clear and restart sessions without closing the private window, improving convenience and privacy management [2]. Additionally, Firefox 151 added support for local profile backups and cross-platform restore on Linux and macOS, allowing users to securely transfer or recover their profiles more easily [1].
Mozilla postponed the native JPEG-XL image decoder feature to Firefox 152 beta, deciding to delay it rather than include it in the current release [1]. Looking ahead, Firefox 152 is expected to introduce a redesigned Settings user interface, which is already enabled by default in Firefox 153 Nightly builds [1, 3].
Firefox 151 is now available for download worldwide, with users able to upgrade immediately to access these features [1, 2].
