Examine source code of Browser Chat

{
  "manifest_version": 2,
  "name": "Browser Chat",
  "version": "0.2.1resigned1",
  "description": "Transform a browser profile into a chat client for multiple web services",
  "icons": {
    "48": "icon-48.png"
  },
  "permissions": [
    "storage",
    "bookmarks",
    "tabs",
    "<all_urls>"
  ],
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      }
    }
  },
  "web_accessible_resources": [],
  "sidebar_action": {
    "default_icon": {
      "48": "icon-48.png"
    },
    "default_title": "Browser Chat",
    "default_panel": "sidebar.html",
    "open_at_install": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e43afdfa-7a21-4262-ae87-70cebf4cf6d9}"
    }
  }
}