Examine source code of mysearch_aread

{
  "manifest_version": 2,
  "name": "mysearch",
  "version": "0.2",
  "author": "aread",
  "description": "Perform a search based on the highlighted text",
  "icons": {
    "48": "icons/logo.jpg"
  },
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8d8db08a-7293-4119-a1a0-2027ad97e774}"
    }
  }
}