Examine source code of SuperCapture

{
  "manifest_version": 3,
  "name": "SuperCapture for Firefox",
  "version": "1.0.364",
  "description": "Capture images, full web pages, slideshows and more.  Requires the desktop app from https://www.supercapture.io",
  "permissions": [
    "activeTab",
    "alarms",
    "contextMenus",
    "scripting",
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "http://localhost:21516/*",
    "<all_urls>"
  ],
  "action": {
    "default_popup": "shared/popup/popup.html",
    "default_icon": {
      "16": "shared/icons/icon16.png",
      "32": "shared/icons/icon32.png",
      "48": "shared/icons/icon48.png",
      "128": "shared/icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background/service-worker.js"
    ],
    "type": "module"
  },
  "icons": {
    "16": "shared/icons/icon16.png",
    "32": "shared/icons/icon32.png",
    "48": "shared/icons/icon48.png",
    "128": "shared/icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content/save-image-hotkey.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content/drag-save.js"
      ],
      "css": [
        "content/drag-save.css"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@supercapture.io",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}