Examine source code of Thesaurus v6

{
  "manifest_version": 2,
  "name": "Thesaurus",
  "description": "Search for synonyms and antonyms of words.",
  "version": "1.0",
  "permissions": [],
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{181d44b9-6520-4f96-8eb2-0af5130f51e9}"
    }
  }
}