Firefox has been missing support for a bunch of CSS 2.* properties for 23 years:
https://bugzilla.mozilla.org/show_bug.cgi?id=132035
https://bugzilla.mozilla.org/show_bug.cgi?id=137367#c18
(which has a comment from seven years ago says it is something that @mozilla.org should be working to implement since every other browser has)

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