So use Firefox where it works, and Chrome where Firefox doesn't work for you. There's a little Firefox extension called "Open with..." which makes it really quick and easy to open a tab or link with another browser.
If the problem is that you don't have enough memory to comfortably use two browsers at once, then... well, then that's your real problem. Get more more RAM.
As for Firefox, although I haven't always been happy with the changes Mozilla has forced on their users, overall it's still the best browser out there, and when it comes to giving you the tools to preserve your privacy specifically it's worlds ahead of the alternatives... although it does take some awareness and effort on part of the user but that's unavoidable nowadays.
multiple browsers are the way to go. I had all my eggs in the chrome basket until their login fiasco, but hit limitations with Firefox. I now configure Firefox and brave with the same extensions and use the both equally. using onetab makes it easy to migrate sessions from one browser to the next.
If the problem is that you don't have enough memory to comfortably use two browsers at once, then... well, then that's your real problem. Get more more RAM.
As for Firefox, although I haven't always been happy with the changes Mozilla has forced on their users, overall it's still the best browser out there, and when it comes to giving you the tools to preserve your privacy specifically it's worlds ahead of the alternatives... although it does take some awareness and effort on part of the user but that's unavoidable nowadays.