I suppose I need two profiles, one for Firefox, one for Waterfox. What is the best way to accomplish this without creating a mess. I have installed both, and want to be able to use both, simultaneously if possible. I did find the article on Using the profile manager to create.... at https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles but it's not enough to move forward confidently. Right now, the default seems to be firefox. attempts to load waterfox load firefox. Thank you. BTW, I have all my plugins on "Ask first". Incredible change in speed, and no more 'hang's' and crashes.