Examine source code of Filter MetaFilter

{
  "manifest_version": 2,
  "name": "Filter MetaFilter",
  "version": "0.5resigned1",
  "description": "Sort and filter Metafilter comments by Favorites.",
  "icons": {
    "48": "icons/mfIcon48x48.png",
    "96": "icons/mfIcon96x96.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/mfIcon48x48.png",
    "default_title": "Filter MetaFilter",
    "default_popup": "popup/defaultPopup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9757fa53-fafb-4eed-a7a9-e6dacd2c3aa4}"
    }
  }
}