Examine source code of Toolbar color profile

{
  "manifest_version": 2,
  "name": "Toolbar color profile",
  "version": "1.2",
  "description": "Set Firefox toolbar color and mode theme",
  "icons": {
    "16": "icon.png",
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "browser_action": {
    "default_title": "Change toolbar color and mode theme",
    "default_popup": "popup.html",
    "default_icon": {
      "96": "icon96.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "theme",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "toolbar-color-profile@ldybiec",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}