I installed it 2 months ago (didn't have to disable/remove any of my plugins or extensions or pop-up blockers, I just searched for Eno in Firefox add-ons & installed on Windows 8.1 w/ Firefox 72.x, later Firefox auto updated to 73.x, 74.0 w/ no problems to virtual card# use) - easy install, no need to restart Firefox or laptop. It's worked great for me since then on many online retail sites. When using for the 1st time on a new retail site, it requires 2 factor authentication w/ your cell, after that it'll save & reuse the newly assigned virtual card# for that site (it also auto fills in the payment form). Each site gets it's own different virtual #. You only have to type in your name on the payment form.