Examine source code of FaceGroupNinja

{
  "icons": {
    "16": "icon16.plasmo.192fd1f9.png",
    "32": "icon32.plasmo.4d28be0c.png",
    "48": "icon48.plasmo.8337b32e.png",
    "64": "icon64.plasmo.c5fef9ed.png",
    "128": "icon128.plasmo.20a0583f.png"
  },
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "icon16.plasmo.192fd1f9.png",
      "32": "icon32.plasmo.4d28be0c.png",
      "48": "icon48.plasmo.8337b32e.png",
      "64": "icon64.plasmo.c5fef9ed.png",
      "128": "icon128.plasmo.20a0583f.png"
    },
    "default_popup": "popup.html"
  },
  "version": "0.0.3",
  "author": "bury",
  "name": "FaceGroupNinja",
  "description": "Turn your Facebook group members into leads.",
  "permissions": [
    "storage",
    "*://*.facebook.com/*"
  ],
  "background": {
    "scripts": [
      "background.806a2724.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.facebook.com/*",
        "https://web.facebook.com/*",
        "https://facebook.com/*",
        "https://*.facebook.com/*"
      ],
      "js": [
        "facebook.9385fb24.js"
      ],
      "css": []
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "support@facegroup.ninja"
    }
  },
  "web_accessible_resources": [
    "facebook.8b3030a5.png"
  ]
}