mobile/Fenix - viewport moves upwards with keyboard

[Djfe]

Your Environment

Firefox on Android (Android 14, Pixel 7 Pro)

Expected Behavior

opening and closing the search's (strg+f) keyboard shouldn't move the viewport

Current Behavior

I open the search, the keyboards gets opened and the viewport moves upward. This does not happen on Chrome on Android. It also doesn't happen on other web pages on Firefox on Android.

Why is this an issue? because if you click anything while the keyboard is opened then Firefox will click on the page but close the keyboard first. The touch ends up on a different position of the viewport than intended, which can be quite annoying:

Steps to Reproduce

https://youtu.be/5FwTLYSi0C0?si=ztS7p6prMag7pM7R

Does anyone have an idea why the viewport moves at all? it moves upwards with the keyboard. Is this a css setting?
I'm not sure, yet, whether this is a bug in Firefox or this page. I haven't found any other page, yet, where the view port moves like this