for firefox? cascade css theme + tab center reborn extension does that, check out the cascade repo i linked, there’s detailed info on how to configure it

Here’s the config file

Import it into nighttab and it should work, you can change the color, background, etc. to your preference.

yeah its through shape corners

yeah the default panels are… lackluster to say the least, at least once you figure out how to use latte. Sad that its not being developed anymore. Hopefully someone forks latte soon, some bug fixes and features would be awesome. But honestly, so far, its not bad, haven’t run into major bugs with plasma updates, so its still viable for use.