[mobile] White space under page footer while cursor in the “Add account name” field

[ValentinaPC]

Build:
Stage

Affected platforms:
Android 10;

Browsers tested on:

• Firefox release;
• Chrome release;

Preconditions:

• The user is logged with an FxA premium account;
• The user has at least one mask generated;.

Steps to reproduce:

• Open Profile page;
• Tap in the “Add account name” field;
• Scroll the page (without closing the keyboard);

Expected result:
Page is scrolled down until the footer;

Actual result:
Page is scrolled down beyond the footer and a white section is displayed;

Notes:

• Not reproducing on Chrome;
• Attaching video;

2022_08_02_14_08_29.mp4