How to check if My Chrome Extension is already installed

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How to detect if my Chrome Extension is already installed in user's browser? Using JavaScript? I am a developer of this extension. Thanks!

1 Answer

Warning! This Answer is INCOMPLETE and I suspect it is even WRONG. Please post a valid answer if you have one, thanks!

Since you mentioned that this is your own extension, I am assuming you also have access to the website that is verified via Webmaster Tools as being associated with this extension in the Chrome Web Store.

if (typeof chrome !== "undefined" && typeof chrome.app !== "undefined" && chrome.app.isInstalled) {
  // extension is installed.
}
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