When I click on green sign in button nothing happens. Just presses then nothing. I am using latest Firefox 64 and even tried with adblocker turned off.
I tried it on my computer as well and since I use local Blockstack Browser, Sign in button opened the link in the default browser (which is Chrome) and then redirected it back to Chrome. So, trying to login in Firefox actually logged me in, in Chrome.
I searched the forum and it looks like there were some issues with FF in the past. But maybe this bug hasn’t been reported yet so I am posting this.