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    <p>There's a way to allow a content script heavy extension to continue functioning after an upgrade, and to make it work immediately upon installation.</p> <h1>Install</h1> <p>The install method is to simply iterate through all tabs in all windows, and inject some scripts programmatically into tabs with matching URLs. </p> <p>Obviously, you have to do it in a <a href="https://developer.chrome.com/extensions/background_pages" rel="noreferrer">background page</a> or <a href="https://developer.chrome.com/extensions/event_pages" rel="noreferrer">event page</a> script declared in manifest.json:</p> <pre><code>"background": { "scripts": ["background.js"] }, </code></pre> <p>background.js:</p> <pre><code>// Add a `manifest` property to the `chrome` object. chrome.manifest = chrome.app.getDetails(); var injectIntoTab = function (tab) { // You could iterate through the content scripts here var scripts = chrome.manifest.content_scripts[0].js; var i = 0, s = scripts.length; for( ; i &lt; s; i++ ) { chrome.tabs.executeScript(tab.id, { file: scripts[i] }); } } // Get all windows chrome.windows.getAll({ populate: true }, function (windows) { var i = 0, w = windows.length, currentWindow; for( ; i &lt; w; i++ ) { currentWindow = windows[i]; var j = 0, t = currentWindow.tabs.length, currentTab; for( ; j &lt; t; j++ ) { currentTab = currentWindow.tabs[j]; // Skip chrome:// and https:// pages if( ! currentTab.url.match(/(chrome|https):\/\//gi) ) { injectIntoTab(currentTab); } } } }); </code></pre> <h1>Upgrade</h1> <p>The upgrade method relies on the fact that the content scripts are left injected after an extension is disabled, uninstalled or upgraded.</p> <p>When the port connection is made, an onDisconnect handler is added. This waits a second after the disconnect event, then attempts to reconnect. If it fails, another onDisconnect is fired so the process happens again, until a connection is made. It's not perfect, but it works.</p> <p>The content script:</p> <pre><code>var port; // Attempt to reconnect var reconnectToExtension = function () { // Reset port port = null; // Attempt to reconnect after 1 second setTimeout(connectToExtension, 1000 * 1); }; // Attempt to connect var connectToExtension = function () { // Make the connection port = chrome.runtime.connect({name: "my-port"}); // When extension is upgraded or disabled and renabled, the content scripts // will still be injected, so we have to reconnect them. // We listen for an onDisconnect event, and then wait for a second before // trying to connect again. Becuase chrome.runtime.connect fires an onDisconnect // event if it does not connect, an unsuccessful connection should trigger // another attempt, 1 second later. port.onDisconnect.addListener(reconnectToExtension); }; // Connect for the first time connectToExtension(); </code></pre>
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