Examine source code of KeyForge Amasser

{
  "action": {
    "default_icon": {
      "48": "icons/amasser-48.png",
      "96": "icons/amasser-96.png",
      "128": "icons/amasser-128.png"
    },
    "default_popup": "dist/popup.html",
    "default_title": "KeyForge Amasser"
  },
  "background": {
    "scripts": [
      "dist/bg.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@keyforge-amasser",
      "strict_min_version": "112.0"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "dist/content-dok.js"
      ],
      "matches": [
        "https://decksofkeyforge.com/"
      ],
      "run_at": "document_idle"
    },
    {
      "js": [
        "dist/content-mv.js"
      ],
      "matches": [
        "https://*.keyforgegame.com/*"
      ],
      "run_at": "document_idle"
    },
    {
      "all_frames": true,
      "js": [
        "dist/content-tco.js"
      ],
      "matches": [
        "https://thecrucible.online/*",
        "https://*.thecrucible.online/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "description": "An unofficial browser extension that collects KeyForge decks from MV and syncs them to DoK or TCO.",
  "host_permissions": [
    "https://*.decksofkeyforge.com/*",
    "https://*.keyforgegame.com/*",
    "https://*.thecrucible.online/*"
  ],
  "icons": {
    "48": "icons/amasser-48.png",
    "96": "icons/amasser-96.png",
    "128": "icons/amasser-128.png"
  },
  "manifest_version": 3,
  "name": "KeyForge Amasser",
  "permissions": [
    "alarms",
    "cookies",
    "storage"
  ],
  "version": "1.0.9",
  "web_accessible_resources": [
    {
      "resources": [
        "icons/dok.png"
      ],
      "matches": [
        "https://*.keyforgegame.com/*"
      ]
    }
  ]
}