manifest.json

{
  
  //name is for make the name of your extension chrome
  "name": "Screenshot Free for Browser",
  //version is for make what is the  version of you extension
  "version": "1.3",
  // description is for make a description of you extension
  "description": "Extesion Free for you take a Screenshot",
  //Used by packaged apps to specify the app's background scripts. 
  "background": {
    "persistent": false,
    //I call the script here
    "scripts": ["background.js"]
  },
  
  //configuration you extension  with icon and title of you extension.
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Take a screen shot!"
  },
  /*
  To use most chrome.* APIs, your extension or app must declare its intent in the "permissions" 
  field of the manifest. Each permission can be either one of a list of known strings (such as "geolocation")
  or a match pattern that gives access to one or more hosts. Permissions help to limit damage if your extension 
  or app is compromised by malware. Some permissions are also displayed to users before installation, as detailed
  in Permission Warnings.
  
  example : 
  "permissions": [
  "serial",
  "storage",
  "videoCapture"
],


  */
  "permissions": [
    "activeTab"
  ],
  
  //version of the manifest_version
  "manifest_version": 2
}