Add option to hide X from tabs on sidebar

[J-PIE-314]

After using the new tab sidebar for a while I have found that the X (close tab) button is annoyingly easy to accidentally click when attempting to switch tabs, especially when a volume button is covering part of the tab icon.

Could there be an option to hide the close button. I can still close tabs by middle-clicking on the icons or using a keyboard shortcut.

[Jon]

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