I seem to be encountering various problems since the update to 73, the main one is the profile folder, I dislike the default location so have previously just put my preferred location in appdata\roaming\mozila\profiles.ini but 73 regularly ignores this and puts a basic profile in the default location and alters profile.ini. Using the profile manager does not get any better results. I am also having problems with the home page, I have set a custom page but 73 often resets this to a blank page or sometimes the default home page. I have had to resort to a 'portable' version as 73 constantly resetting things was getting so annoying but the portable does not work well as a default browser.