Sign-in to Firefox account to sync won't go past the email entry page
I'm looking to sync my Firefox account between my desktop and a laptop. I went to the menu, clicked on the sign in button next to "sync and save data", and landed on the account sign in page. However, after I entered my email address for my account, the page hasn't moved on to ask for my password. The blue bar underneath it is currently doing the circling thing and I don't understand why. I can sign into Firefox on its own, but not to sync.
Any help appreciated. Thanks.