It works perfectly for me as far as clicking a number and it dialing without any issues. My one problem is it also thinks zip codes, account numbers and misc numbers are phone numbers. It will note a phone listed as (555)555-5555 but won't recognize 555-555-5555. If I increase the "max" number to look for it picks up every account number on the page. So I may end up with 50 clickable "phone" links on a page when there should only be two or three. This has been the best replacement for Telify which is no longer compatible with FF I have been able to find. Just a little more tweaking and it will be perfect.