Are you talking about the home page? https://support.mozilla.org/en-US/kb/how-to-set-the-home-page

Or the search engine? Type about:preferences#search<enter> in the address bar. You can select any search engine to be your default from here.

You can also remove any engine from here.

Your ‘logged-in’ status is stored in special cookies. If the cookie is removed, you are logged out.

You may be in Private Browsing mode or told Firefox not to remember.

Type about:preferences#privacy<enter> in the address bar. The button next to History, select Use Custom Settings.

Turn off Always Use Private Browsing Mode Turn on Remember My Browsing And Download History At the bottom of the page, turn on Clear History When Firefox Closes. At the far right, press the Settings button. Turn on ONLY Cache and Form And Search History leaving the others off.

Macs: Make sure you install Firefox properly and that you do not run Firefox from within the DMG (Disk Images) file. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Hi FredMcD. Thanks for the guidance. It appears that a recent Windows 10 Update changed my Windows Settings. I right-clicked on the Start button and went to Power Options. The screen was set to turn off after a very brief period of time, and the PC was set to go to sleep after a very brief period of time. I changed both settings to "Never", and my machine is behaving normally now.

My default browser is Firefox, and the Windows Update didn't change that setting. I'm going to do a Restart to see if Bing automatically launches.

Thanks again for your help. Leland Befort

Glad to help. Safe Surfing.