u/tophf

I've converted Violentmonkey a couple of days ago to MV3 but it's not yet published even as a beta because it's still being tested and you can help.

1. download the latest official CI build's zip with mv3 in its name like Violentmonkey-test-mv3-...... (if you don't have a github account use this nightly.link that allows downloading the latest artifact)
2. unpack it and load as an unpacked extension in chrome://extensions
3. enable Allow User Scripts in chrome://extensions -> details for Violentmonkey
4. click the reload icon for the extension in that details page just in case

This will be a separate extension with its own id, but if you want to reanimate your currently installed Violentmonkey you can copy the "key" line from manifest.json of the old extension in your profile or use the one below of the official CWS jinjaccalgkegednnccohejagnlnfdag.

1. edit manifest.json of the unpacked extension in an editor

2. click right after { at the beginning of the file and paste the following text (don't forget the comma at the end):

   "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvNNjtIVXIerv8ArGiIk2xHgO2/vmDXgMNPl5ok6zGTkndXXXzz1z5FyqThG41KTw+7Ax4UGid0Q0DVo3aHD/CLJTLBzWlDwpgM3vskBBtOSxYZhWDPFv5vgj+8UQ5sbArgJYdVtlVnv8wFkUfwqbSQZzsBY/VH6fXik0JaWBY09zAe4CvrTtr5ilq9HxVQM6bGTYnQ2aYtwAJIMWdvS1XR0za4mvyxwPn/IjLer54O1Z2atarGTmINVcoyzmO6C/EeMmblc+yb6AaInwKbNIKKjv+pZfxnUKfXfmKtfxhsOpvULLeo4Z45z+HU4I8RimO8MeiGbmrrLrnOPmRcz+0QIDAQAB",