And in fact will save you CPU cycles. For a bit, Chrome had a slight performance edge over Firefox. But once Google got the market share, Firefox caught up and got ahead, and Chrome didn't invest in keeping up, so Firefox is generally faster. The only exception is a few sites (especially Google ones) seem to be heavily optimised for Chrome, but not necessarily as much for Firefox. If you stay away from those sites, Firefox is generally faster.

Plus Chromium is increasingly becoming more hostile to efficient ad blocking add-on implementations - so if you want to block ads (generally recommended due to ad networks doubling as paid malware distribution networks), Firefox or other Gecko-based browsers are generally the best bet.