I have a Windows 10 Home PC (version 1903 os build 18362.476) with Firefox 70.0.1 (64-bit) installed. My Firefox browser in will not start-up in a maximized-state, it reverts to a minimized. Generally, when I close my browser, I just hit the "x" button on the top right corner or I choose 'Exit' from the menu. As a note, the only changes I made to the browser were in about:config - privacy.resistFingerprinting =true and privacy.trackingprotection.fingerprinting.enabled= true. When I set both to ''false", the browser opens correctly in a maximized-state.