The following bookmarklets are designed to help you quickly check availability and appraise domain names as you browse the web.
To save, either right-click the icon or link and save as a bookmark to your bookmark toolbar OR just drag it up there.
To use, simply highlight text on a webpage then click the bookmarklet to check whether the name is available to be registered via GoDaddy or get its appraisal value from Estibot, respectively.
If no extension is included in the selected text, .com is assumed.
If no text is selected at all, you will be taken to GoDaddy or Estibot where you can enter a name into their form by hand.
Disclosure: The owner of this site is an affiliate for the aforementioned sites and may be compensated if you make a purchase from them after using one of the bookmarklets.