Getting -> Origin * is not allowed by Access-Control-Allow-Origin

Your code has a couple of small issues:

• Your manifest file only requests permissions for http://*/*, not https://*/*, so your request to an HTTPS site is failing. You need the permission to be *://*/*, so you can get all pages on all domains over all protocols, not just over HTTP.

• A second issue is that you expect your $.ajax call to return a boolean, but that is not what happens. The $.ajax call has two callbacks that each return a boolean, but checkSSL terminates before the Ajax call completes, meaning that checkSSL always returns undefined.

What you want to do instead is provide checkSSL with a callback function as an argument:

function checkSSL(url, callback){ $.ajax({ url: url, type:'HEAD', error: function() { callback(false); }, success: function() { callback(true); } }); } 

Then, use that callback to run call the code after the call to checkSSL:

function redirect() { chrome.tabs.query({active: true}, function(tabArray) { var currentURL = tabArray[0].url; //http://facebook.com var httpsURL = generateSSL(currentURL); //https://facebook.com if(httpsURL == currentURL){ console.log(currentURL+" is already on HTTPS"); chrome.browserAction.setIcon({path:"../images/padlock_green.png"}); } else { // call checkSSL and take action in an anonymous callback function! checkSSL(httpsURL, function(urlDoesExist) { if(urlDoesExist) { chrome.tabs.update(tabArray[0].id, {url: httpsURL}); chrome.browserAction.setIcon({path:"../images/padlock_green.png"}); chrome.browserAction.setBadgeText({text:"SSL"}); console.log("SSL found,"+currentURL+" redirected to"+httpsURL); } else { //donothing console.log(currentURL+" has no SSL"); chrome.browserAction.setIcon({path:"../images/padlock_red.png"}); } }); } }); } 

Notice the changes to the code below the first else. We can't decide what to do until the Ajax call has resolved, so we have the Ajax success and error functions fire a callback with a boolean argument. That callback function then takes action based on the value of the boolean.