Cannot sign in to web app in Firefox

When I navigate to the web app and click the “Continue with Email” button, nothing appears to change on the screen. I can tell there is a sign in form “underneath” because my password manager opens to fill it in, and my cursor becomes an I-cursor at two different spots (presumably the username and the password). I tried this in a private window to make sure none of my browser extensions were causing it and it happened there too. Running in Firefox in Linux Mint.