Mozilla Firefox since v127.0 cannot install anymore the Adobe Acrobat Pro extension (adobe_acrobat-1.0-windows.xpi) file
Tested on more then one PC: The Adobe Acrobat Pro extension (the adobe_acrobat-1.0-windows.xpi file) cannot be installed anymore in the Mozilla Firefox web browser and it always gives an error message upon its installation: "This add on could not be installed because it appears to be corrupt".
More detailed infos already here:
https://forums.mozillazine.org/viewtopic.php?p=14985444#p14985444
https://support.mozilla.org/en-US/questions/1466884#answer-1678658
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Brus
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Brus
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in the meantime, I also get this answer by e-mail from:
https://discourse.mozilla.org/t/upgraded-add-on-signatures/129599
And I even find also this one here:
https://blog.mozilla.org/addons/2019/10/31/firefox-to-discontinue-sideloaded-extensions/