Examine source code of Heximo

{
  "manifest_version": 2,
  "name": "Heximo",
  "version": "0.5.2",
  "description": "History export/import extension for firefox",
  "icons": {
    "16": "icons/heximo_plain.svg",
    "32": "icons/heximo_plain.svg",
    "48": "icons/heximo_plain.svg",
    "96": "icons/heximo_plain.svg"
  },
  "browser_action": {
    "default_icon": "icons/heximo_plain.svg"
  },
  "sidebar_action": {
    "default_title": "Heximo",
    "default_panel": "sidebar/sidebar.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "history",
    "downloads",
    "menus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c48d804-6ba2-41a7-bb54-5f5ca606961b}"
    }
  }
}