Examine source code of BlockDropper

{
  "manifest_version": 3,
  "name": "BlockDropper",
  "version": "3.2",
  "description": "A web tool that can pick color to find the matching blocks.",
  "permissions": [
    "tabs",
    "activeTab",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "action": {
    "default_popup": "/popup/popup.html",
    "default_icon": "color-picker.png"
  },
  "background": {
    "scripts": [
      "utils.js",
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1bfeb970-cd11-4e4f-98be-f168b04307a2}",
      "strict_min_version": "109.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "/content/content.css"
      ],
      "js": [
        "utils.js",
        "/content/content.js"
      ]
    }
  ],
  "commands": {
    "pick-from-webpage": {
      "suggested_key": {
        "default": "Alt+A"
      },
      "description": "Pick color from web page"
    },
    "clear-result": {
      "suggested_key": {
        "default": "Alt+Q"
      },
      "description": "Clear result"
    }
  }
}