Examine source code of PaletteSpy

{
  "manifest_version": 3,
  "name": "PaletteSpy",
  "version": "0.2.5.1",
  "description": "Detect themes, pick colors, and find gradients on any website.",
  "browser_specific_settings": {
    "gecko": {
      "id": "palettespy@palettespy-extension",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "Open PaletteSpy"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "sidebar.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}