Examine source code of Shiori extension

{
  "manifest_version": 2,
  "name": "Shiori create bookmarks extension",
  "description": "This extension allow you to create new bookmarks into shiori. https://github.com/RadhiFadlillah/shiori",
  "version": "1.3resigned1",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{92f50b26-ff02-4323-970d-80151adbcee5}"
    }
  }
}