Examine source code of Easy Reader

{
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "{8ce97a4e-927f-407b-aec9-a1a2aced5d67}"
    }
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "browser_action" : {
    "browser_style": true,
    "default_title" : "__MSG_extensionName__" ,
    "default_icon" : {
      "64" : "icons/logo_64.png"
    }
  },
  "description" : "__MSG_extensionDescription__" ,
  "manifest_version" : 2 ,
  "name" : "Read Mode",
  "permissions" : [
    "tabs" ,
    "notifications" 
  ],
  "version" : "1.0",
  "icons" : {
    "32" : "icons/logo_32.png",
    "48" : "icons/logo_48.png",
    "64" : "icons/logo_64.png"
  }
}