I found a solution by myself:
Add a single line in the the file modules/util/isGreasemonkeyable.js, it
is marked yellow below.
You find this in your Firefox-Profile, in sub directory "extensions" (e. g.
"c:\Users\__YourWindowsUser__\AppData\Roaming\Mozilla\Firefox\Profiles\xxxxxxxxx.default\extensions")
and then the "greasemonkey.xpi" which may have a cryptic name like
"{e4a8a97b-f2ed-450b-b12d-ee082ba24781}.xpi"
case "file":
*case "jar":*
return GM_prefRoot.getValue('fileIsGreaseable');
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