diff --git a/beastify_edge/content_scripts/beastify.js b/beastify_edge/content_scripts/beastify.js
index 26985e5..aae7ba9 100644
--- a/beastify_edge/content_scripts/beastify.js
+++ b/beastify_edge/content_scripts/beastify.js
@@ -37,6 +37,7 @@
    * Listen for messages from the background script.
    * Call "beastify()" or "reset()".
   */
+  let browser = chrome || browser;
   browser.runtime.onMessage.addListener((message) => {
     if (message.command === "beastify") {
       insertBeast(message.beastURL);
diff --git a/beastify_edge/popup/choose_beast.js b/beastify_edge/popup/choose_beast.js
index 53e6591..93ebd78 100644
--- a/beastify_edge/popup/choose_beast.js
+++ b/beastify_edge/popup/choose_beast.js
@@ -12,6 +12,7 @@ const hidePage = `body > :not(.beastify-image) {
  */
 function listenForClicks() {
   document.addEventListener("click", function(e) {
+    let browser = chrome || browser;
     /**
      * Given the name of a beast, get the URL to the corresponding image.
      */
@@ -74,5 +75,6 @@ function listenForClicks() {
  * When the popup loads, inject a content script into the active tab,
  * and add a click handler.
  */
+let browser = chrome || browser;
 browser.tabs.executeScript({file: "/content_scripts/beastify.js"});
 listenForClicks();
\ No newline at end of file
diff --git a/color_changer/js/background.js b/color_changer/js/background.js
index 9546e6f..4e6e2b3 100644
--- a/color_changer/js/background.js
+++ b/color_changer/js/background.js
@@ -1,3 +1,5 @@
+let browser = chrome || browser;
+
 // listen for sendMessage() from content script
 browser.runtime.onMessage.addListener(
     function (request, sender, sendResponse) {
diff --git a/color_changer/js/content.js b/color_changer/js/content.js
index 7888209..4e7493c 100644
--- a/color_changer/js/content.js
+++ b/color_changer/js/content.js
@@ -4,6 +4,7 @@ var url = document.location.href;
 // if not on a docs.microsoft.com domain
 if (url.indexOf("//docs.microsoft.com") <= -1) {
     // send inactive icons
+    let browser = chrome || browser;
     browser.runtime.sendMessage({
         "iconPath20": "images/inactive20.png",
         "iconPath40": "images/inactive40.png"
diff --git a/color_changer/js/popup.js b/color_changer/js/popup.js
index 69e7f61..01590c2 100644
--- a/color_changer/js/popup.js
+++ b/color_changer/js/popup.js
@@ -1,3 +1,5 @@
+let browser = chrome || browser;
+
 // get the buttons by id
 let aliceblue = document.getElementById('aliceblue');
 let cornsilk = document.getElementById('cornsilk');
diff --git a/color_changer/manifest.json b/color_changer/manifest.json
index 11dc78f..eaf9c1b 100644
--- a/color_changer/manifest.json
+++ b/color_changer/manifest.json
@@ -1,4 +1,5 @@
 {
+  "manifest_version": 2,
   "name": "Color Changer",
   "author": "Microsoft Edge Extension Developer",
   "description": "Change the color of the body on docs.microsoft.com",