Made the onvideo control start with the stop icon if needed.

background.js

@@ -32,19 +32,35 @@ chrome.runtime.onMessage.addListener(function (request, sender, callback) {
     }
   } else if (request.message == "addSponsorTime") {
     addSponsorTime(request.time);
+  } else if (request.message == "getSponsorTimes") {
+    getSponsorTimes(request.videoID, function(sponsorTimes) {
+      callback({
+        sponsorTimes: sponsorTimes
+      })
+    });
+
+    //this allows the callback to be called later
+    return true;
   }
 });
 
-function addSponsorTime(time) {
+
-  //get sponsor times
+//gets the sponsor times from memory
+function getSponsorTimes(videoID, callback) {
   let sponsorTimes = [];
-  let sponsorTimeKey = "sponsorTimes" + previousVideoID;
+  let sponsorTimeKey = "sponsorTimes" + videoID;
   chrome.storage.local.get([sponsorTimeKey], function(result) {
     let sponsorTimesStorage = result[sponsorTimeKey];
     if (sponsorTimesStorage != undefined && sponsorTimesStorage.length > 0) {
       sponsorTimes = sponsorTimesStorage;
     }
 
+    callback(sponsorTimes)
+  });
+}
+
+function addSponsorTime(time) {
+  getSponsorTimes(previousVideoID, function(sponsorTimes) {
     //add to sponsorTimes
     if (sponsorTimes.length > 0 && sponsorTimes[sponsorTimes.length - 1].length < 2) {
       //it is an end time
@@ -58,6 +74,7 @@ function addSponsorTime(time) {
     }
 
     //save this info
+    let sponsorTimeKey = "sponsorTimes" + previousVideoID;
     chrome.storage.local.set({[sponsorTimeKey]: sponsorTimes});
   });
 }

content.js

@@ -1,7 +1,5 @@
 if(id = getYouTubeVideoID(document.URL)){ // Direct Links
-  //reset sponsor data found check
+  videoIDChange(id);
-  sponsorDataFound = false;
-  sponsorsLookup(id);
 
   //tell background.js about this
   chrome.runtime.sendMessage({
@@ -43,9 +41,7 @@ chrome.runtime.onMessage.addListener( // Detect URL Changes
   function(request, sender, sendResponse) {
     //message from background script
     if (request.message == "ytvideoid") { 
-      //reset sponsor data found check
+      videoIDChange(request.id);
-      sponsorDataFound = false;
-      sponsorsLookup(request.id);
     }
 
     //messages from popup script
@@ -76,6 +72,25 @@ chrome.runtime.onMessage.addListener( // Detect URL Changes
     }
 });
 
+function videoIDChange(id) {
+  //reset sponsor data found check
+  sponsorDataFound = false;
+  sponsorsLookup(id);
+
+  //see if the onvideo control image needs to be changed
+  chrome.runtime.sendMessage({
+    message: "getSponsorTimes",
+    videoID: id
+  }, function(response) {
+    if (response != undefined) {
+      let sponsorTimes = response.sponsorTimes;
+      if (sponsorTimes != undefined && sponsorTimes.length > 0 && sponsorTimes[sponsorTimes.length - 1].length < 2) {
+        toggleStartSponsorButton();
+      }
+    }
+  });
+}
+
 function sponsorsLookup(id) {
     v = document.querySelector('video') // Youtube video player
     let xmlhttp = new XMLHttpRequest();