Examine source code of Selection Context Search

{
  "description": "Right click on a selected text and choose the search website from the popup window or the context menu.",
  "manifest_version": 2,
  "name": "Selection Context Search",
  "version": "5.19",
  "icons": {
    "225": "icons/icon-225.png"
  },
  "permissions": [
    "activeTab",
    "alarms",
    "bookmarks",
    "cookies",
    "contextMenus",
    "storage",
    "tabs",
    "unlimitedStorage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "open_in_tab": true
  },
  "web_accessible_resources": [
    "icons/open_link.png"
  ],
  "applications": {
    "gecko": {
      "id": "{3923146e-98cb-472b-9c13-f6849d34d6b8}",
      "strict_min_version": "57.0"
    }
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAiJ+RWsFHn6FapQQeArBceqZaKp5M8r3dNrW7uMhUTzPega3jX5zZtMmr7XgX5DHC/wAsApXPLynKTuDPFXhbs9m01R/ZYuR7UuE+qzflZK1+7OzZjKvKysiJeFcb+oZ/6H8jVV/010F2Opxyi9Vkb9tNJsmawQpxVrwoO7bTLvU1/0Jt/0fVrenOW98ZfRi5qFJEnQipCvsavfIUZZC/8qYV+u0bXMAS96ygLOOWM4Xvss5yOxZ8qaYGP/vLirZij2pCmJtpVIcALQ558YM2/It8pVnjsvyUFoT46pkk6qs9jvaAY/aBr8DJ++Dr4LL6240fTsf2Rh2OJCczHpTUOQIDAQAB"
}