Customers / login.liquid
Head into the template: customers / login.liquid and look for "customer.login.password".
Below the password input add: Show password
Theme.js
Dance theme.js, add everything at the end:
function myFunction() { var x = document.getElementById ("CustomerPassword"); if (x.type === "password") { x.type = "text"; } else { x.type = "password"; } }
Which will give you this: