Examine source code of !C Search

{
  "name": "!C Search",
  "description": "Search extension for Sabanci University Information Center",
  "version": "1.1.1",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon32.png"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "MacCtrl+Shift+F"
      },
      "description": "Opens popup.html"
    }
  },
  "background": {
    "scripts": [
      "rightclick.js"
    ]
  },
  "permissions": [
    "contextMenus",
    "tabs"
  ],
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "128": "icon128.png"
  }
}