Examine source code of Page Color 3Picker

{
  "manifest_version": 3,
  "name": "Page Color Picker",
  "version": "1.0.0",
  "description": "Pick and save simple page background colors for easier reading.",
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "Page Color Picker",
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon.svg",
      "96": "icons/icon.svg"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "page-color-picker@example-addon.local",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}