Examine source code of Inkpull

{
  "manifest_version": 2,
  "name": "Inkpull",
  "version": "4.0.0",
  "description": "Download fanfics from FanFiction.net and AO3 as HTML and EPUB",
  "browser_specific_settings": {
    "gecko": {
      "id": "inkpull@extension",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "activeTab",
    "downloads",
    "storage",
    "notifications",
    "tabs",
    "https://www.fanfiction.net/*",
    "https://m.fanfiction.net/*",
    "https://archiveofourown.org/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Inkpull",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "96": "icons/icon96.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "src/storage.js",
      "src/sites/ao3.js",
      "src/sites/ffnet.js",
      "src/background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.fanfiction.net/s/*",
        "https://m.fanfiction.net/s/*",
        "https://archiveofourown.org/works/*"
      ],
      "js": [
        "src/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  }
}