Examine source code of Cite This Web

{
  "description": "Cite This Web",
  "manifest_version": 2,
  "name": "btnextension",
  "version": "1.0",
  "background": {
    "scripts": [
      "/cite_this_web.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/cite_icon_16.png",
      "32": "icons/cite_icon_32.png"
    }
  },
  "sidebar_action": {
    "default_icon": {
      "16": "icons/cite_icon_16.png",
      "32": "icons/cite_icon_32.png"
    },
    "default_title": "Cite This Web",
    "default_panel": "/index.html",
    "open_at_install": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6cfdf11b-4141-4c09-b098-6333fe437dba}"
    }
  }
}