Examine source code of mateo Recorder

{
  "name": "mateo Recorder",
  "short_name": "mateo Recorder",
  "description": "mateo Recorder Firefox Extension",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "icons/mateo.png",
      "32": "icons/mateo.png",
      "48": "icons/mateo.png",
      "128": "icons/mateo.png"
    },
    "default_title": "mateo Recorder"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "icons": {
    "16": "icons/mateo.png",
    "32": "icons/mateo.png",
    "48": "icons/mateo.png",
    "128": "icons/mateo.png"
  },
  "web_accessible_resources": [
    "icons/mateo.png",
    "libs/recorder.js",
    "background.js",
    "css/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "match_about_blank": true,
      "js": [
        "libs/recorder.js"
      ],
      "run_at": "document_end"
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "incognito": "split",
  "version": "2.1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{8da3f2f3-0e7b-4384-8dc7-c387a76f96a6}"
    }
  }
}