How to disable font become bold when hovering the cursor over a tab?

[congcongkuo]

Normal state:

While hovering:

I want to disable this feature.

[Jelmerro]

Sure thing, you can disable this with custom themes. You can add a new colorscheme in one of the folders documented in :help colorscheme, but the default one is ~/.vieb/colors, where you can add new CSS files that change the colorscheme. Since the default theme will remain active, it will take a few override rules to disable it, this will disable it once put in a new file in the colors folder:

#tabs > span:hover {font-weight: normal !important;}

Let me know if you need more information or help with it :)