While https://github.com/Betterbird/thunderbird-patches/blob/main/115/bugs/1829370-add-on-installation-non-focused-linux.patch "fixes" the non-working buttons it' disabling the security fix cited here: https://bugzilla.mozilla.org/show_bug.cgi?id=1399937#c37
Bug 1829370 Comment 20 Edit History
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While https://github.com/Betterbird/thunderbird-patches/blob/main/115/bugs/1829370-add-on-installation-non-focused-linux.patch "fixes" the non-working buttons it's disabling the security fix cited here: https://bugzilla.mozilla.org/show_bug.cgi?id=1399937#c37