You can use { -brand-name-firefox } and still have { -brand-name-chrome }. { -brand-name-chrome } won’t change on your machine one bit.
Můžete používat { -brand-name-firefox(case: "acc") } i { -brand-name-chrome(case: "acc") }. Vašeho nastavení { -brand-name-chrome(case: "gen") } se ani nedotkneme.