I use several browsers for several reasons (surfing, downloading files, logging into accounts...) but I prefer Chrome for doing "risky" things like browsing websites which I don't know whether they are safe or not, and I installed several extensions on it to gain a higher safety level: ScriptSafe, Adblock plus and Ghostery. I don't use any sandbox tool.
For I use the same pc and OS to browse the internet and logging into my accounts, I would like to install a password manager to be more safe and I trust it may help if someone enter my system and looks for saved passwords somewhere in my pc.
But let's consider the following scenario: a keylogger attacks me and is able to read what I'm typing on the keyboard; as far as I enter a master password to use my password manager I have to type one. Well, some password managers allow the password-free authentication option (means you don't have to remember a master password) and for the scenario above it seems to me a safe option.
My question is: while configuring a password manager, is it safer to set the password-free authentication to avoid typing the master password and being vulnerable to keyloggers? Or should I consider any other threats which make safer setting a master password?