Examine source code of ResponsePro

{
  "manifest_version": 2,
  "name": "ResponsePro",
  "version": "1.3",
  "author": "Christopher James Morton",
  "description": "ResponsePro is the ultimate Firefox addon for streamlined response management in customer service. With ResponsePro, you can quickly and efficiently handle customer inquiries, saving valuable time and increasing productivity.",
  "homepage_url": "https://github.com/ChristopherJamesMorton/ResponsePro",
  "content_security_policy": "script-src 'self' 'sha256-b6342b8420e432f87678b47248db87679eef745a864dd2478e8c7e37bd285f44' 'sha256-360cb7d454baf678fd7ee2620177512f472ed9b3a704a08bb6c39a88bc7b146d' 'sha256-eb60f83ffd6f71c1ec5761331b86e32a5c042fa6440a7d1b2de2f5fbaf45221e' 'sha256-85b04e1fc0fbc0d0f8eb3b2a28efcaf17b29abc2ed2994bb54b220c9b471f7d4'; object-src 'self'",
  "icons": {
    "16": "icons/ResponsePro_16.png",
    "32": "icons/ResponsePro_32.png",
    "48": "icons/ResponsePro_48.png",
    "96": "icons/ResponsePro_96.png",
    "128": "icons/ResponsePro_128.png",
    "192": "icons/ResponsePro_192.png",
    "256": "icons/ResponsePro_256.png",
    "512": "icons/ResponsePro_512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://extensionpay.com/*"
      ],
      "js": [
        "popup/extpay.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "popup/extpay.js",
      "background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/ResponsePro_32.png",
    "default_title": "ResponsePro",
    "default_popup": "popup/interface.html"
  },
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{04ac0cd8-b52a-42e3-895f-daf75920ec65}"
    }
  }
}