Examine source code of SaveMyTabs Manager

{
  "manifest_version": 2,
  "version": "0.0.0.8",
  "name": "SaveMyTabs Manager",
  "author": "TheLitcyCoder (Alicia Harewood)",
  "description": "SaveMyTabs Manager can be used to save URL from current tab. Build a list of targeted leads to keep track of.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    }
  },
  "icons": {
    "16": "icon.png",
    "32": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'none';",
  "optional_permissions": [
    "https://*.firebaseapp.com/*",
    "https://firebase.googleapis.com/"
  ],
  "web_accessible_resources": [
    "ExtPay.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/",
        "https://*/"
      ],
      "js": [
        "popup.js",
        "profile.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "thelitcycoderwebdev@gmail.com",
      "strict_min_version": "109.0"
    }
  }
}