As far as my experience goes: Firefox does not support centrally installed extensions, Firefox ESR does support centrally installed extensions, Thunderbird does not support centrally installed extensions.I solved my thunderbird problem with a policies.json file:

{
  "policies": {
    "Extensions": {
      "Install": [
        "file:///C:/Program Files (x86)/Mozilla Thunderbird/extensions/[email protected]",         "file:///C:/Program Files (x86)/Mozilla Thunderbird/extensions/@unitedstatesenglishdictionary.xpi",         "file:///C:/Program Files (x86)/Mozilla Thunderbird/extensions/[email protected]",         "file:///C:/Program Files (x86)/Mozilla Thunderbird/extensions/[email protected]",         "file:///C:/Program Files (x86)/Mozilla Thunderbird/extensions/[email protected]"
      ],
      "Uninstall": [],
      "Locked": [
        "[email protected]",
        "@unitedstatesenglishdictionary",
        "[email protected]",
        "[email protected]",
        "[email protected]"
      ]
    }
  }
}

which seems to work for me (I still use the 32-bit version of Thunderbird, I put updated xpi versions in the same location with every upgrade of thunderbird and those upgrades get installed too).

Best regards
Rudi Hoeben

On 17/11/2020 11:14, Marco Gaiarin wrote:
Mandi! James Pearson
   In chel di` si favelave...

I've found (with Firefox), that I can only get some centrally installed 
extensions to load if I give the xpi file the name of UUID of extension - e.g. 
something like:
  {3d7fec2e-0469-4893-9b16-cdb6738eab93}.xpi
Good.


The UUID might be in the manifest.json file, or if not,
No, no UUID in manifest file.


by looking for a suitable string starting with { and ending with } in the 
META-INF/cose.sig and META-INF/mozilla.rsa files ...
There's no META-INF folder in extensions.


Also, if i install 'personally' the extensions (eg, with my yser, in
user folder) they are written as '[email protected]'.


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