Review Mozilla 1981563: [Tab Management Phase 1] Add secret setting toggle for Tab Management Redesign

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Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1981563

Description

This bug plus 1978549 change the way the active tab is selected in the tabs tray and affects or patch " TB 34403 [android]: Disable Normal mode by default.".

When rebasing 143 I just picked up the new changes without checking it, but this ticket is to check that all is fine.

Edited Aug 28, 2025 by brizental

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