Add handling for searching via context menu

Author: Chrisvin

extension/backgroundContextMenus.js

@@ -0,0 +1,16 @@
+
+'use strict';
+
+chrome.runtime.onInstalled.addListener(function() {
+    chrome.contextMenus.create({
+        id: "stack_overflow_search_context_id",
+        title: "Search in StackOverflow",
+        type: 'normal',
+        contexts: ['selection'],
+    });
+});
+
+chrome.contextMenus.onClicked.addListener(function(item, tab) {
+    let searchUrl = "https://www.stackoverflow.com/search?q="+item.selectionText;
+    chrome.tabs.create({url: searchUrl, index: tab.index + 1});
+});