Until recently, Firefox treated not including links in the tab order as a macOS norm it should honor, only including them when the OS Keyboard Navigation toggle was enabled.
In Firefox 127 they changed that, always including links in the tab order, as Chrome for Mac did and as Firefox does on other platforms. (Note Firefox ESR 115 is still a supported version and still requires the OS Keyboard Navigation toggle.)
https://www.mozilla.org/en-US/firefox/127.0/releasenotes/#note-790143
Christian Alder (npub10u2…dp4q)