Examine source code of GoodWrite

{
  "name": "GoodWrite - inteligenty korektor tekstu",
  "description": "Sprawdza pisownię i gramatykę języka polskiego, podpowiada synonimy i poprawia styl tekstu.",
  "version": "1.0.16",
  "icons": {
    "128": "assets/GW_128.png"
  },
  "homepage_url": "https://goodwrite.pl",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "permissions": [
    "unlimitedStorage",
    "storage"
  ],
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "kontakt@goodwrite.pl",
      "strict_min_version": "42.0"
    }
  },
  "host_permissions": [
    "https://api.goodwrite.pl/*",
    "http://api.goodwrite.pl/*",
    "https://api.goodwrite.pl/check/*",
    "http://api.goodwrite.pl/check/*"
  ],
  "background": {
    "scripts": [
      "background/background.bundle.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "options/assets/*",
        "assets/*",
        "../assets/*",
        "../../assets/*",
        "*.woff",
        "*.woff2",
        "*.eot",
        "*.svg",
        "*.ttf",
        "*.css",
        "*.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_scripts": [
    {
      "all_frames": true,
      "match_about_blank": true,
      "js": [
        "contentscript/contentscript.bundle.js"
      ],
      "css": [
        "contentscript/contentscript.css"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end"
    }
  ]
}