Initial work to get working in Firefox

assets/js/devtools.js

@@ -1,12 +1,12 @@
-/* global chrome */
-
-// Create a connection to the background page
-var backgroundPageConnection = chrome.runtime.connect({
-    name: "devtools-page"
-});
-
-// Send a message to background page with the current active tabId
-backgroundPageConnection.postMessage({
-    name: 'init',
-    tabId: chrome.devtools.inspectedWindow.tabId
-});
+/* global browser */
+
+// Create a connection to the background page
+var backgroundPageConnection = browser.runtime.connect({
+    name: "devtools-page"
+});
+
+// Send a message to background page with the current active tabId
+backgroundPageConnection.postMessage({
+    name: 'init',
+    tabId: browser.devtools.inspectedWindow.tabId
+});