... That question means that you have actually missed my previous post here ; latest NM28 gladly accepts palefill-1.30.xpi as a compatible extension (and doesn't disable it permanently, if already installed) ...
Yes, that's right. I definitely missed your post. Thanks for the info!
In all honesty, I didn't test on latest St52, as I left that as an exercise for you ; the observed bug with palefill (and other extensions that have strictCompatibility=true inside their instal.rdfs) was caused by ae7c40d, which first appeared in the 20260418 UXP releases (actual buildID dates may be slightly different inside individual apps); that commit was reverted in 12e7d14, which first appears in this weekend's (20260502) UXP releases; since these are platform-wide commits, I have no reason to think that St52 hasn't been "fixed", while NM28 has; if you find otherwise, please let us know ,,,
Best regards.
I'll soon install the most recent updates and test them.