It's not like people don't know about Tor. I guess a lot of people know about Tor, but they don't use it because Tor sometimes works pretty slowly. People love to save their login history in their browser so they don't have to enter the URL or login credentials every time. Also, there might be several other reasons why people prefer regular browsers.
~snip~
In general, this slowness exists because of the way Tor works, but I can say from my experience that I am quite satisfied with the speed with which I surf with Tor, even if I use it with a VPN. However, considering that a lot of people use smartphones exclusively to access the internet, it is possible that they have the same problem as me, the mobile version works quite slowly for me personally, and it connects to the internet even slower.
As for saving passwords in the browser in any form, that is a very bad idea. Even when using any other browser, I clear all browsing data before turning off my computer - the amount of data left behind if you don't do this regularly can be truly overwhelming, and then you suddenly wonder why you're running out of space on your HDD.