Yes, Firefox is pretty much unbeatable in performance per tab. I just installed the tab counter addon and it reports that I currently have >1500 tabs open in Firefox. I know from experience that if I run just a tenth of that in Chromium the whole system will basically lock up. And as pretty much every other more conventional browser is based on Chromium nowadays there's no alternative really unless I get a RAM upgrade.
Ah, but if you use https://addons.mozilla.org/en-US/firefox/addon/tab-stats/ then you can not only get the count, but also be able to mass-close large numbers of tabs (eg specific duplicate URLs, or everything for specific domains). A tab hoarder's best friend.
(Pretty clever to use telemetry for this, though.)
