Examine source code of Read Later

{
  "manifest_version" : 3 ,
  "name" : "Read Later",
  "description" : "Save pages to read later with notes, tags, and favicons.",
  "version" : "2.1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "read-later@example.com",
      "strict_min_version": "109.0"
    }
  },
  "action" : {
    "default_popup" : "popup.html",
    "default_title" : "Read Later",
    "default_icon" : {
      "16" : "icon-16.png",
      "48" : "icon-48.png",
      "128" : "icon-128.png"
    }
  },
  "permissions" : [
    "storage" ,
    "tabs" 
  ],
  "icons" : {
    "16" : "icon-16.png",
    "48" : "icon-48.png",
    "128" : "icon-128.png"
  }
}