Firefox Connnector Whitelisting - Group Policy

Hi there,

I'm an IT administrator, and am currently trying to whitelist the Firefox Zotero Connector.
In Firefox, we have all extensions blocked by default using ExtensionSettings within the Firefox ADMX template. Desired applications are then unblocked using their extension ID and install URL.

My problem is I can't seem to get the right details which will allow Zotero to install. Does anyone know what the correct settings are?
Here's what I have tried:

Extension ID: (found in About:support)
Install URL:
Install URL 2nd attempt:
Install URL 3rd attempt:

And here's how it's formatted in the actual policy:
"": {
"installation_mode": "allowed",
"install_url": ""

Firefox ExtensionSettings documentation:

Any advice greatly appreciated!

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