"Check my spelling as I type" box became unchecked everytime I start Firefox.

When I start Firefox, the "Check my spelling as I type" is unchecked. When I check it, it remains active and the spell checker works correctly, as long as Firefox session remains open. When I close Firefox and re - start, the box is unchecked again.

Thank you.

Your list of details of the system shows that you have a user.js file in the profile folder to initialize prefs each time you start Firefox.
The user.js file will be present if you or a other software created this file and normally will not present.

You can check its contents with a text editor (right click: 'Open with'; do not double-click).
The user.js file is read whenever Firefox is started and initializes the preferences to the specified value in this file, so the preferences set via user.js can be changed temporarily for the current session.

You can remove the user.js file if you do not create this file yourself.

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

Tags: Firefox

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