Examine source code of Open Same Tab

{
  "name": "Open Same Tab",
  "author": "Terry",
  "version": "0.1.7",
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "16": "icon_16.png",
    "24": "icon_24.png",
    "38": "icon_38.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "permissions": [
    "activeTab",
    "notifications",
    "storage",
    "webNavigation"
  ],
  "optional_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icon_16.png",
      "24": "icon_24.png",
      "38": "icon_38.png",
      "48": "icon_48.png"
    },
    "default_title": "__MSG_pageActionTitle__"
  },
  "options_ui": {
    "chrome_style": true,
    "page": "options.html"
  }
}