Can someone name me the browsers that supports; Windows, Linux, Mac, Android, iOS (via WebKit) that does NOT spy on you? Oh, wait that’s Firefox! Opera but not sure if they are monitoring or not, who else? Chrome, clearly spy’s on you, so that’s OUT...
Additionally, Firefox can sync Tabs, Accounts/paswrds (no 3 party program/fees), etc. There is also a reason Tor uses Firefox, Security. Now, I’m not saying it’s the best but it’s not the worst.
As for memory, a lot of that is really depends on the actual website! (YES, This is a FACT!)
I know a lot of Enterprises that are using Firefox because of cross platform consistency and security.
Anyone reading this using Chrome, Google thanks you for being their product, (FACT: YOU ARE THEIR PRODUCT!).
You want porn, now only does Google know this but they actually know the style and actual videos you watch. Even worse, they keep those logs internal FOREVER! Try Firefox or Opera, Safari if on Mac, but considering everything that Google knows about YOU, everything!