Examine source code of Hover Image Downloader

{
  "manifest_version": 2,
  "name": "Hover Image Downloader",
  "version": "1.0",
  "description": "Hover over any image or video on any webpage and press a customisable hotkey to instantly download it to your Downloads folder. Supports full-size image resolution via srcset and data attributes, overlay-piercing detection for sites like Instagram, configurable save subfolder, and a dark mode popup.",
  "browser_specific_settings": {
    "gecko": {
      "id": "hover-image-downloader@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "downloads",
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon48.png",
      "96": "icons/icon96.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Hover Image Downloader",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}