Why use Chrome anyway? It's inferior in most ways (probably all ways?) - Firefox has supported Windows 11's suspend power state modes for a while now too, not sure if Chrome does the sa,me? In this state, if the browser is minimised, then the OS effectively puts it to sleep and it uses much lower resources and should have no impact on CPU or memory. Otherwise tabs that have content pages open will still be using GPU/CPU cycles, especially if GPU acceleration is being done. This can affect your gaming performance.
RAM is trivial, the more you have the more an app or game will use within reason. This is more about gaming performance, not memory use, and for that, Firefox is currently excellent.