Minimize vertical tabs when not hovered by cursor.

[mentallykim]

What: Vertical tabs can take less space on the top of my browser, which makes it a little comfortable, but please add a feature that can hide the vertical tabs when not being used or hovered by the mouse cursor. 

Why: I want an uninterrupted and immersive experience of Firefox using the vertical tab.

For example, Brave browser has an option to do this feature.

[Jon]

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