Examine source code of Coinverse - Instant Currency Conversion

{
  "manifest_version": 2,
  "name": "Coinverse: Instant Currency Converter",
  "description": "Coinverse offers fast and simple currency conversion for 160+ currencies with automatic detection and instant results.",
  "version": "1.3.4",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "author": "TransLab <coinverse@googlegroups.com>",
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "windows": "Alt+Shift+P",
        "mac": "Command+Shift+P"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{74ce26af-cbc8-47a0-8620-f69ea618487b}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Coinverse - Popup",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "content-scripts/content.css"
  ]
}