This is an extremely light-weight add-on which adds a small WHOIS button next to your address bar. This allows you to perform WHOIS queries very quickly and easily.
(NEW) Most recently added features:
+ Perform a WHOIS look-up on the URL in the address bar, so you don't even have to load that page first.
+ Perform a WHOIS look-up for a hyperlink from the context menu by right-clicking it. No need to copy/paste.
Some additional features to appear in the next version (which will be released very soon);
+ Open your WHOIS query result in this tab or a new tab (load/open or load in the background).
+ Move the WHOIS button anywhere you want to match your toolbar layout.
+ Additional look-up tools include IP information, traceroute and Alexa data
+ Perform WHOIS for ccTLD's at the source. Some TLD providers do not provide contact details, now you can easily look up .be domains at DNS.be, .nl domains at SIDN.nl or .eur domains at EURid.