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Firefox keeps going back to default settings

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Usually when I start Firefox, it starts with the settings I have made at the beginning.

1) I have chosen a startup page as default

2) When downloading, I want to be asked where I want to download

3) I have three active add-ons that make my surfing life easier

About two weeks back, this is what I experience every time I start Firefox after I start my computer, and often it's enough that about an hour has passed since the last time I used/ran Firefox:

1) My chosen homepage doesn't open. Instead I get the two default tabs with the pages that are default after a fresh install of Firefox.

2) The download folder is set to default, instead of the setting that I chose myself.

3) My add-ons are nowhere to be found, and I have to add them all over again.

My work-around is to log in and sync Firefox, but that should not be necessary. Every time I start Firefox, it's back to default settings, and it takes a minute or half a minute for the sync to finish.

I have tried a complete uninstall (including cleaning the Mozilla folder from %appdata%) and then installing Firefox again. But it just doesn't work.

So, help.

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Valgt løsning

Do you have an "Old Firefox Data" folder on the desktop in case you have used the Refresh feature in Firefox and have created a new profile?

Do you have multiple profiles if you check that in the default location for profiles?

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

Go up one level to the \Mozilla\Firefox\Profiles\ folder to check if there is only one profile.

  • C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\

You can check for problems with preferences.

Delete possible user.js and numbered prefs-##.js files and rename/remove the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in current Firefox releases.

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Valgt løsning

Do you have an "Old Firefox Data" folder on the desktop in case you have used the Refresh feature in Firefox and have created a new profile?

Do you have multiple profiles if you check that in the default location for profiles?

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

Go up one level to the \Mozilla\Firefox\Profiles\ folder to check if there is only one profile.

  • C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\

You can check for problems with preferences.

Delete possible user.js and numbered prefs-##.js files and rename/remove the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in current Firefox releases.

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I didn't have multiple profiles nor any user.js, but anyway... I wasn't actually able to reset Firefox before I re-installed it. Now it seems to work just fine after resetting, all my settings are saved even after a reboot. So I shouldn't have any more problems with it.

Thanks!