Examine source code of Colorize Windows

{
  "description": "Bring color to your browser windows",
  "manifest_version": 3,
  "version": "1.0",
  "name": "Colorize Windows",
  "homepage_url": "https://github.com/lets-create-something/colorize-windows",
  "icons": {
    "96": "icons/96.png",
    "128": "icons/128.png"
  },
  "action": {
    "default_icon": {
      "96": "icons/96.png",
      "128": "icons/128.png"
    },
    "default_title": "Colorize Windows",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "colors.js",
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c8a9187-d8c9-49b0-b904-0b0891b0137d}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "theme",
    "activeTab",
    "storage",
    "sessions"
  ]
}