api compat checks

src/background.js

@@ -171,6 +171,7 @@ var bg_isBackground = true,
         refreshBadgeAndMenu();
     });
 
+    if (chrome.windows) {
         chrome.windows.onFocusChanged.addListener(function (windowId) {
             if (windowId === null || windowId < 0) {
                 return;
@@ -178,7 +179,9 @@ var bg_isBackground = true,
 
             refreshBadgeAndMenu();
         });
+    }
 
+    if (chrome.contextMenus) {
         chrome.contextMenus.onClicked.addListener(function (info, tab) {
             if (info.menuItemId === 'generate-password') {
                 ga('send', {
@@ -229,6 +232,7 @@ var bg_isBackground = true,
                 });
             }
         });
+    }
 
     if (chrome.webRequest && chrome.webRequest.onAuthRequired) {
         chrome.webRequest.onAuthRequired.addListener(function (details, callback) {
@@ -300,7 +304,7 @@ var bg_isBackground = true,
 
     var buildingContextMenu = false;
     function buildContextMenu(callback) {
-        if (buildingContextMenu) {
+        if (!chrome.contextMenus || buildingContextMenu) {
             return;
         }
         buildingContextMenu = true;
@@ -367,6 +371,10 @@ var bg_isBackground = true,
     }
 
     function setIcon() {
+        if (!chrome.browserAction.setIcon) {
+            return;
+        }
+
         bg_userService.isAuthenticated(function (isAuthenticated) {
             bg_cryptoService.getKey().then(function (key) {
                 var suffix = '';
@@ -388,6 +396,10 @@ var bg_isBackground = true,
     }
 
     function refreshBadgeAndMenu() {
+        if (!chrome.windows || !chrome.contextMenus) {
+            return;
+        }
+
         chrome.tabs.query({ active: true, windowId: chrome.windows.WINDOW_ID_CURRENT }, function (tabs) {
             var tab = null;
             if (tabs.length > 0) {
@@ -418,7 +430,7 @@ var bg_isBackground = true,
     }
 
     function loadMenuAndUpdateBadge(url, tabId, contextMenuEnabled) {
-        if (!url) {
+        if (!chrome.browserAction.setBadgeBackgroundColor || !url) {
             return;
         }
 
@@ -429,6 +441,10 @@ var bg_isBackground = true,
 
         chrome.browserAction.setBadgeBackgroundColor({ color: '#294e5f' });
 
+        if (!chrome.browserAction.setBadgeText) {
+            return;
+        }
+
         menuOptionsLoaded = [];
         bg_loginService.getAllDecryptedForDomain(tabDomain).then(function (logins) {
             logins.sort(bg_loginService.sortLoginsByLastUsedThenName);
@@ -704,7 +720,7 @@ var bg_isBackground = true,
     }
 
     function loadContextMenuOptions(title, idSuffix, login) {
-        if (menuOptionsLoaded.indexOf(idSuffix) > -1) {
+        if (!chrome.contextMenus || menuOptionsLoaded.indexOf(idSuffix) > -1) {
             return;
         }
         menuOptionsLoaded.push(idSuffix);