added shortcut manager and allow user to customize toggle mode shortcut

browser/lib/utils.js

@@ -54,7 +54,25 @@ export function escapeHtmlCharacters (text) {
       : html
 }
 
+export function isObjectEqual (a, b) {
+  const aProps = Object.getOwnPropertyNames(a)
+  const bProps = Object.getOwnPropertyNames(b)
+
+  if (aProps.length !== bProps.length) {
+    return false
+  }
+
+  for (var i = 0; i < aProps.length; i++) {
+    const propName = aProps[i]
+    if (a[propName] !== b[propName]) {
+      return false
+    }
+  }
+  return true
+}
+
 export default {
   lastFindInArray,
-  escapeHtmlCharacters
+  escapeHtmlCharacters,
+  isObjectEqual
 }