Examine source code of Domgrapper

{
  "manifest_version": 2,
  "name": "Domgrapper",
  "version": "1.0",
  "description": "search url related domain or using regex",
  "icons": {
    "48": "icons/matches-48.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "webNavigation",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/matches.png",
    "default_title": "Domgrapper",
    "default_popup": "popup/domgrapper.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "popup/run-script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f55ae56c-cf8f-4f5f-b9f0-5eb126823fc2}"
    }
  }
}