Firefox always opens all tabs that were open when last closed

Firefox, started out of the blue, to always show my tabs in the last session when it is started. I checked Firefox not listed in the Task Manager list after closing. So I tried the following:

-change the "Startup of Firefox" option to all three of the available choices
-Change the setting browser.startup.page 0 manually via "subject: config.
-from Firefox in safe mode.

None of them changed the behavior. It nevertheless opens the tabs that were open last.

I'm under V25.0. Any suggestions? It is a major nuisance.

You can check if you have a user.js file in the Firefox profile folder that affects the pref browser.sessionstore.resume_session_once true value.

The user.js file appears only if you or another software created, therefore, normally, he wouldn't be here.
You can check its contents with a text editor if you do not create this file yourself.

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

Tags: Firefox

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