Examine source code of Page Wallpaper

{
  "manifest_version": 2,
  "name": "Page Wallpaper",
  "short_name": "Page Wallpaper",
  "version": "1.4.0",
  "description": "Use a locally stored image of your choice as the background on websites.",
  "author": "Infinity",
  "icons": {
    "48": "icons/page-wallpaper.svg",
    "96": "icons/page-wallpaper.svg"
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "alarms",
    "<all_urls>"
  ],
  "commands": {
    "toggle-wallpaper": {
      "suggested_key": {
        "default": "Ctrl+Shift+B"
      },
      "description": "Toggle Page Wallpaper on/off"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-backdrop.js",
        "content-scanner.js",
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_title": "Page Wallpaper",
    "default_icon": {
      "48": "icons/page-wallpaper.svg",
      "96": "icons/page-wallpaper.svg"
    },
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{3a7cfe9d-efb4-4854-ba59-5d748cbd0ef5}"
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}