I am currently on version 110 of firefox. It is driving me crazy how there is no physical object or deliminator between tabs. they all just blend in. Is there any way to add the "|" (pipe command) between the tabs so they have some sort of separation?
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This CSS rule will only affect tabs that aren't selected (:not([selected])). You haven't changed the border color to make this easier to see, but not selected tabs should be further spaced if you increase the border-width. Border width for selected tabs are best left unchanged to avoid issues with multi-selected tabs or other rules applied to the selected tab in some cases.