Examine source code of Simple Notes - SimpleTools.nl

{
  "name" : "__MSG_extName__" ,
  "description" : "__MSG_extDesc__" ,
  "default_locale" : "en" ,
  "homepage_url" : "https://www.simpletools.nl/apps/simple-notes.php",
  "manifest_version" : 2 ,
  "version" : "1.0.0",
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "browser_action" : {
    "default_icon" : {
      "19" : "images/icon19.png",
      "38" : "images/icon38.png"
    },
    "default_popup" : "popup.html",
    "default_title" : "__MSG_extName__" 
  },
  "sidebar_action": {
    "default_title" : "__MSG_extName__" ,
    "default_panel": "sidebar.html",
    "default_icon" : "sidebar.png"
  },
  "icons" : {
    "16" : "images/icon16.png",
    "32" : "images/icon32.png",
    "48" : "images/icon48.png",
    "64" : "images/icon64.png",
    "128" : "images/icon128.png"
  },
  "permissions" : [
    "tabs" ,
    "contextMenus" ,
    "storage" ,
    "<all_urls>" 
  ]
}