Examine source code of Web page annotator

{
  "manifest_version" : 2 ,
  "name" : "Web page annotator",
  "description" : "Displays a sidebar that lets you take notes on web pages.",
  "version" : "1.0",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "54.0a1",
      "id": "{37fc0be2-6aff-4339-9cce-7e95b23b00e4}"
    }
  },
  "sidebar_action": {
    "default_icon" : "icons/star.png",
    "default_title" : "Annotator",
    "default_panel": "sidebar/panel.html"
  },
  "permissions" : [
    "storage" ,
    "tabs" 
  ],
  "commands" : {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      }
    }
  }
}