See https://support.mozilla.org/en-US/kb/firefox-backup/history (a revision is pending review to update the note for fx150 (thanks to Denys). From the Firefox 150 release notes, https://www.firefox.com/en-US/firefox/150.0/releasenotes/ (quote) [Backing up a profile to a file](https://support.mozilla.org/kb/firefox-backup} is now available to all Windows 10 and 11 users, including those who use the new profile management system.
Bug 2026783 Comment 14 Edit History
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See https://support.mozilla.org/en-US/kb/firefox-backup/history (a revision is pending review to update the note for fx150 (thanks to Denys). From the Firefox 150 release notes, https://www.firefox.com/en-US/firefox/150.0/releasenotes/ (quote) [Backing up a profile to a file](https://support.mozilla.org/kb/firefox-backup) is now available to all Windows 10 and 11 users, including those who use the new profile management system. I can confirm that the Sync settings panel gives me the option to turn on Backup, running Firefox 150 on Windows 11.
See https://support.mozilla.org/en-US/kb/firefox-backup/history (a revision is pending review to update the note for fx150 - thanks to Denys). From the Firefox 150 release notes, https://www.firefox.com/en-US/firefox/150.0/releasenotes/ (quote) [Backing up a profile to a file](https://support.mozilla.org/kb/firefox-backup) is now available to all Windows 10 and 11 users, including those who use the new profile management system. I can confirm that the Sync settings panel gives me the option to turn on Backup, running Firefox 150 on Windows 11.