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How come, since I've had tab groups enabled, Firefox never goes to the homepage when launched and instead goes to the sites that I last closed?

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Whenever I launch Firefox now, instead of my homepage, it goes to whichever tabs I was on before I had previously closed it.

Whenever I launch Firefox now, instead of my homepage, it goes to whichever tabs I was on before I had previously closed it.

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check your home page setup

How to set the home page

Could be that Tools > Options > General : when Firefox starts is set to

"show my windows and tabs from the last time"".

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You can check if you have an user.js file in the Firefox profile folder that sets the browser.sessionstore.resume_session_once pref to true.

Rename or delete the prefs.js file and possible numbered prefs-##.js files and a possible user.js file to reset all prefs to the default value.

You can use this button to go to the Firefox profile folder:

  • Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)

Note that your System Details List shows that you have a user.js file in the profile folder to initialize some prefs on each start of Firefox.

The user.js file is only present if you or other software has created it, so normally it wouldn't be there. you can check its content with a plain text editor if you didn't create this file yourself.

The user.js file is read each time you start Firefox and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.