After a recent update, everytime I open Firefox, the Add-ons dialogue box opens on top of the home page. How can I stop it from opening each time?

The question contains all the information I can provide

Ok I found a solution that worked for me, I simply dragged the user.js and the user.js.BAK to the desktop, before that I had done the same with the prefs.js and prefs.js.BAK, but that didn't help, so it's apparently the user file that was an error with.
It was the link from cor-el that helped me on the way http://kb.mozillazine.org/Preferences_not_saved It's at the bottom titled User.js file locks certain preferences. This article can also help https://support.mozilla.com/en-US/kb/Preferences%20are%20not%20saved
It have still not made a new user.js file, but everything runs fine, hope this can help others to.

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