I have never heard of such a thing. Are these computers linked to each other? I do not mean sharing the same internet, I mean a direct connection. One possibility is she had selected the '''Send Link To Device,''' but that would send the link. Not open a new tab. ------- Tell her to; [https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode Start Firefox using Troubleshoot(Safe) Mode] {web link} A small dialog should appear. Click '''Start In Troubleshoot(Safe) Mode''' (not Refresh). Is the problem still there?