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
Brus
shared this idea
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Michael K.
commented
I have the same issue:
The installation of Acrobat Continuous Release brings an Add-on for the Browser Firefox. Since sideloading's of Extensions are no longer supported in Firefox, the installation of the Acrobat PDF-Extension needs to be done manually.
The *.xpi-File "adobe_acrobat-1.0-windows.xpi" can be found in "C:\Program Files\Adobe\Acrobat DC\Acrobat\Browser\WCFirefoxExtn\WebExtn\signed_extn".
Unfortunately, the Code Signing of the xpi-File is outdated, leads into an error message during manual install.
Firefox is an important browser, the Firefox-Extensions for Acrobat should be maintained in regular intervals, so that they work in the latest Firefox-Versions.
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Brus
commented
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/