Mitaka

Available as a Chrome extension and Firefox add-on, Mitaka lets you search over six dozen search engines for IP addresses, domains, URLs, hashes, ASNs, Bitcoin wallet addresses, and various indicators of compromise (IOCs) from your web browser.

The extension saves up your time by acting as a shortcut to various online databases that can be queried with a click.

For those who prefer a focused, more limited set, an alternative extension Sputnik is also available.