Is there a way through JavaScript to detect if a Safari Extension is already installed? https://extensions.apple.com has some way of doing it because they update the install link to "installed" if the extension is already installed. However, I can't figure out how they do it. I've traced it back to an object of type 'SafariExtensionGalleryController" but that's as far as I get.
Did Apple put special hooks into the extension system just for their stuff??
Lost...
Thx, Joel
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