I've actually started using Firefox more because Chrome has been causing me problems. Recently downloading more than 3 files from Google takeout at a time broke Chrome. With Firefox I hit 20 simultaneous files with no slowdown. Chrome actually hung until my downloads finished. Made it impossible to work at all while I downloads files. Same issue in incognito. Firefox was great.

I recently built a PC and included 32GB of RAM specifically so I can have a hundred tabs open without any lag, never had a issue with Firefox.