Pin tabs to prevent automatic closing on Android

[Nagauchuk]

I really like Firefox for Android, but I would like to suggest a "Pin Tab" feature.
Currently, the browser may automatically close or discard tabs to save memory, or they can be closed accidentally when clearing all tabs.
It would be great to have an option to "Pin" specific tabs so they:
Cannot be closed by the "Close all tabs" command.
Stay active and are protected from automatic cleanup.
Are visually distinct in the tab switcher.
This would be very helpful for keeping important research or often-used pages always at hand.

[Jon]

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