how do I delete an ad-on
I don't need or want to automatically download iCloud photos but when trying to clear out my iCloud account, it tells me I have to remove the add-on from Firefox
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See:
Extensions that do not have a "Remove" button are installed by other software and are not under control of the Firefox extension manager.
Such globally installed extensions are usually found via a registry scan or are installed in a location that Firefox scans for installed extensions.
Extensions installed this way need to be removed via the settings (options/preferences) of the program that has added this extension or you need to uninstall this program via "Control Panel > Programs".
In Firefox you an only disable such an extension.