Examine source code of Random Joke Generator

{
  "name": "Random Joke Generator",
  "version": "0.0.2",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "logo.png"
  },
  "icons": {
    "128": "logo.png"
  },
  "permissions": [
    "activeTab"
  ]
}