Actually having 50 tabs should not be an issue RAM-wise. The problem is that chrome (and firefox quantum) open many many processes and therefore consume a lot of ram. Quantum is expected to be much better than current Chrome in Ram consumption. Because chromium allegedly opens seperate processes for each tab(?), quantum uses the same process for a couple of tabs and thus allows resource sharing.

In a single processed browser, ram is not an issue. I've been using 25+ tabs for many years, only recently in Chrome I experienced a low ram warning (i have 8GB). I switched back to firefox 56.