I recently factory reset my Pixel 3 XL. Upon reinstalling Firefox, I navigated to the "Sign in to sync" option to sign in to the Firefox Account I use for my desktop and laptop. On the "Turn on Sync" page, I pressed the "Ready to Scan" option, scanned the barcode from firefox.com/pair when visited on my Desktop, and pressed the "Sign In" option when it appeared. Once signed in, an external browser tab opens to my Firefox Accounts page but nothing further happens; I can view the login in the history, view my correct account name and change my password, but there is no option to finalize the sync. I have tried closing the tab, I have also tried pressing the sandwich button and using the "Open in Firefox" menu option. Nothing actually enables the sync for my Android device. The attached screenshot shows the page I am successfully logged into on my phone after pressing the options described above.