I have a slew of web hosting user names and passwords stored in my browser and it’s a PITA to have to go look them up every time I update my sites, not mention all the log ins I have.
Can’t do it.
Firefox has an option to ‘protect’ them but it is so aggravating and time consuming.
I use Password Safe for username and passwords. I can copy the encrypted file to anywhere, and not worry about losing it.
If you don’t delete tracking cookies, every website you visit can track you. If that is fine with you, then there is no need to worry. But, don’t think that Facebook is the only offender.