Examine source code of quickscope

{
  "manifest_version": 2,
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "*://*/*"
  ],
  "optional_permissions": [
    "bookmarks",
    "tabs"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "background": {
    "scripts": [
      "backgroundScript.js"
    ]
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "name": "quickscope",
  "description": "A simple but powerful search bar for your new tab.",
  "version": "0.0.3"
}