[Feature/CSS Request] Dynamically hide Firefox's tabs of other folders/trees

[couleurm]

I have tons of folders and would like that all of the Firefox's own vanilla horizontal tabs are filtered depending on what currently tab you have opened contains

[irvinm]

TST is basically just a virtual representation of Firefox's native tabs. If you wanted to hide the native tabs, you can easily do that by calling tabs.hide() from an addon [https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs/hide] but that would also hide it from TST.

I believe TST honors the visibility of a tab and if it is hidden from the horizontal tabs bar, it will be hidden from the sidebar as well.