Examine source code of Editer

{
  "manifest_version" : 2 ,
  "name" : "Editer",
  "version" : "1.0",
  "description" : "Instantly Edit Web Pages in your browser with a single click to instantly edit text and layout elements directly in the browser. Ideal for quick content testing, web design, debugging, meme making, and more!",
  "permissions" : [
    "activeTab" ,
    "scripting" ,
    "commands" 
  ],
  "commands" : {
    "toggle-editor": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Command+Shift+Y"
      },
      "description" : "Toggles the editer on/off"
    }
  },
  "browser_action" : {
    "default_popup" : "popup.html",
    "default_icon" : {
      "16" : "icons/icon-16.png",
      "32" : "icons/icon-32.png",
      "48" : "icons/icon-48.png",
      "128" : "icons/icon-128.png"
    }
  },
  "icons" : {
    "16" : "icons/icon-16.png",
    "32" : "icons/icon-32.png",
    "48" : "icons/icon-48.png",
    "128" : "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "devVijay@edit.er",
      "strict_min_version": "58.0"
    }
  },
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "content.js" 
      ]
    }
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ],
    "persistent" : true 
  }
}