Feature request: Option to highlight duplicate tabs

[gamedevsam]

Even a simple BG or border color change would be enough for me. With tab groups it's easier than ever to have duplicate tabs across groups, so being able to identify them at a glance would be valuable for me.

[chzesa]

If your use case is only closing the duplicate tabs, I would recommend installing another addon for it.

The groups view could use a way to filter tabs, and this could have support highlighting duplicates.