callto: tel
callto: tel, a Firefox Greasemonkey script, automatically identifies telephone numbers within hCard microformat contacts and creates callto: links to open calls in Voice-over-IP software such as Skype.
To use callto: tel:
- Install Firefox
- Install Greasemonkey
- Install the callto: tel Greasemonkey script
- Visit some sites with hCard contacts
- Make phone calls from the web!