Detect Chrome extension first run / update

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In newer versions of Chrome (since Chrome 22), you can use the chrome.runtime.onInstalled event, which is much cleaner.

Example:

// Check whether new version is installed
chrome.runtime.onInstalled.addListener(function(details){
    if(details.reason == "install"){
        console.log("This is a first install!");
    }else if(details.reason == "update"){
        var thisVersion = chrome.runtime.getManifest().version;
        console.log("Updated from " + details.previousVersion + " to " + thisVersion + "!");
    }
});

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