Examine source code of Easy Redirect

{
  "manifest_version": 2,
  "name": "Easy Redirect",
  "description": "Quick launch social media sites",
  "version": "1.0.1",
  "icons": {
    "128": "logo_128.png"
  },
  "browser_action": {
    "default_icon": "logo_19.png",
    "default_popup": "popup.html"
  },
  "permission": [
    "activeTab"
  ]
}