Examine source code of Riots

{
  "manifest_version": 2,
  "name": "Riots",
  "description": "This extension will fix journalistic errors",
  "version": "1.0",
  "icons": {
    "16": "assets/images/fire_16.png",
    "48": "assets/images/fire_48.png",
    "128": "assets/images/fire_128.png"
  },
  "browser_action": {
    "default_icon": "assets/images/fire_128.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ]
}