Examine source code of Historia Quick Launcher

{
  "name": "Historia Quick Launcher",
  "version": "2.1.1",
  "description": "Quick Launch App for Historians",
  "manifest_version": 2,
  "homepage_url": "https://extension-historia.github.io/",
  "icons": {
    "16": "icons/icon_16px.png",
    "32": "icons/icon_32px.png",
    "48": "icons/icon_48px.png",
    "128": "icons/icon_128px.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cffbf3a9-4095-435c-b71f-c358ede91304}"
    }
  }
}