Photo: rafapress (Shutterstock)After the design overhaul of Firefox 89, the version 90 update is comparatively timid. To update to the latest version, open the Firefox app and go to Settings > General > Firefox Updates > Check for updates. Firefox is also rolling out a version 90 update for Android, which you can get from the Google Play Store. Now, when you try to log in using Facebook, Firefox will recognize this, and will temporarily allow it (only for the login process). Firefox 90 also adds back/forward cache features for supported websites, so you might find going back and forth between webpages faster.