Losing data after android switch between firefox and Aquamail

On my Android samsung phone, I often need to switch from Firefox app to Aquamail app and then back to Firefox app . The reason is to read the code sent to confirm identity (for MFA) The concern is when I'm back to Firefox app, it refreshes the Firefox page and ... the browsed website send again another code in a new mail... This loop prevents me definitively the connection to the browsed website! (Unless I have a separate PC to read mails without leaving Firefox app on my phone). It happens for about 75% of the websites I need. And is probably linked to the manner the different websites are written. I precise than I accepted cookies from all these websites ( hotels, regular buying, electric car loading, etc). What can I do on Firefox options or on Android options to avoid the concern, which is really a blocking point ? Thanks for any help. Ulysse Samsung A32 Android 10 Android Firefox last version Android Aquamail 1.59