whoru
This addon allows you to make whois queries from the address bar by typing "whois domain.com" (where domain.com is the domain that you'd like to query), and the resulting page will be the whois listing for that domain. Also, ping.
Additional files are visible only to premium users
manifest.json
{
"description": "intercept webrequest for WHOIS",
"manifest_version": 2,
"name": "whoru",
"version": "1.2",
"permissions": [
"webRequest",
"webRequestBlocking",
"https://www.google.com/search?client=*"
],
"background": {
"scripts": [
"whoisAddressBarInterpreter.js"
]
}
}