Updated it to use my database

content.js

@@ -0,0 +1,73 @@
+if(id = getYouTubeVideoID(document.URL)){ // Direct Links
+  sponsorsLookup(id);
+}
+
+//was sponsor data found when doing SponsorsLookup
+var sponsorDataFound = false;
+
+
+chrome.runtime.onMessage.addListener( // Detect URL Changes
+  function(request, sender, sendResponse) {
+    if (request.message === 'ytvideoid') { // Message from background script
+        sponsorsLookup(request.id);
+    }
+
+    //messages from popup script
+    if (request.message === 'sponsorStart') {
+      sponsorMessageStarted();
+    }
+
+    if (request.message === 'infoFound') {
+      sendResponse({
+        found: sponsorDataFound
+      })
+    }
+});
+
+function sponsorsLookup(id) {
+    v = document.querySelector('video') // Youtube video player
+    var xmlhttp = new XMLHttpRequest();
+    
+    //check database for sponsor times
+    xmlhttp.open('GET', 'http://localhost/api/getVideoSponsorTimes?videoID=' + id, true);
+
+    xmlhttp.onreadystatechange = function () {
+        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
+            sponsorDataFound = true;
+
+            sponsors = JSON.parse(xmlhttp.responseText);
+
+            // If the sponsor data exists, add the event to run on the videos "ontimeupdate"
+            v.ontimeupdate = function () { 
+                sponsorCheck(sponsors);
+            };
+        }
+    };
+    xmlhttp.send(null);
+}
+
+function sponsorCheck(sponsors) { // Video skipping
+    sponsors.forEach(function (el, index) { // Foreach Sponsor in video
+        if ((Math.floor(v.currentTime)) == el[0]) { // Check time has sponsor
+            v.currentTime = el[1]; // Set new time
+        }
+    });
+}
+
+function getYouTubeVideoID(url) { // Returns with video id else returns false
+    var regExp = /^.*((youtu.be\/)|(v\/)|(\/u\/\w\/)|(embed\/)|(watch\?))\??v?=?([^#\&\?]*).*/;
+    var match = url.match(regExp);
+    return (match && match[7].length == 11) ? match[7] : false;
+}
+
+function sponsorMessageStarted() {
+    let v = document.querySelector('video');
+
+    console.log(v.currentTime)
+
+    //send back current time
+    chrome.runtime.sendMessage({
+      message: "time",
+      time: v.currentTime
+    });
+}