Examine source code of Sugu Search

{
  "name": "Sugu Search",
  "description": "Instant spotlight like search and actions with Sugu Search for your browser",
  "version": "1.0.1",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "icons/logo-16.png",
      "48": "icons/logo-48.png",
      "64": "icons/logo-64.png",
      "128": "icons/logo-128.png"
    }
  },
  "icons": {
    "16": "/icons/logo-16.png",
    "48": "/icons/logo-48.png",
    "64": "/icons/logo-64.png",
    "128": "/icons/logo-128.png"
  },
  "commands": {
    "open-sugu": {
      "suggested_key": {
        "default": "Ctrl+Shift+K",
        "mac": "Command+Shift+K"
      },
      "description": "Open Sugu Search"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end",
      "js": [
        "build/sugu.js"
      ],
      "css": [
        "build/sugu.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "build/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "activeTab",
    "bookmarks",
    "browsingData",
    "history",
    "search"
  ],
  "web_accessible_resources": [
    "sugu-new.html",
    "fonts/*",
    "icons/*",
    "build/*"
  ]
}