Sign in and verify my account

Hello Firefox, I'm not 100 % sure but I think my question/problem has been solved?Today I found out my chrome browser on Android 7 is out of date after years of problem free usage. I checked my browser with browser.org checker and the checker sent me to Google play store to download you android 7 browser. I have a Firefox account on Windows 10. I entered my details but couldn't login all I saw was blank black screen. I created a new account for Android phone but still I couldn't login and verify. I saw the same black blank screen as before. Now I have tried to login to Firefox from my out of date chrome browser and was able to confirm my new Firefox account for Android phone. I guess before I was trying to login to Firefox from Firefox without success. Now I have logged in to Firefox from chrome browser I could confirm my email address with code number received. Why did I have trouble logging in and confirming new account email address?. Thank you