Popover has been enabled in Nightly 122, you can track progress in Bug 1866993.

we need to add accessibility support in before we can land this patch

There's still some work to do, it will be enabled by default in version 122.

i see its disabled by default in version 122. Also the firefox release notes for Firefox 122 mentions it as an experimental feature. See https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/122 (search for “Popover API”)

In which Firefox version is it planned to be enabled by default? Thanks in advance

Version 125 as per Bug 1866993.

Thanks a lot @zeroknight