Earlier quoted context omitted.
When Skype is installed, it changes each phone number in your browser to a Skype button. For years webdesigners have been going crazy trying to convince either their clients to uninstall Skype or Skype to provide a durable fix for not wanting your phone-numbers highlighted. You can safely call the Skype extension evil malware, if your giant call-to-action phonenumber is forced to be written like this: 012-34[span sty…
Does it? I still see numbers normally in all my 3 browsers (Chrome, Opera, Safari).
It is a firefox plugin