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I have customized my Firefox toolbar. After closing the browser and then reopening it, the toolbar has returned to the way it was before I customized it. How do I get my customization of the toolbar to become permanent?

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I have customized my Firefox toolbar several times. After closing the browser and then reopening it, the toolbar has returned to the way it was before I customized it each time. How do I get my customization of the toolbar to become permanent? It has occurred with Firefox 4.0.1 and 5.0

I have customized my Firefox toolbar several times. After closing the browser and then reopening it, the toolbar has returned to the way it was before I customized it each time. How do I get my customization of the toolbar to become permanent? It has occurred with Firefox 4.0.1 and 5.0

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see http://kb.mozillazine.org/Corrupt_localstore.rdf

Take a picture of your toolbars so you can easily reconstruct them from the default after solving the the problem.

If it happens to you it will probably happen again in the future so you might want to keep some copies of your modified localstore.rdf file so you can delete the bad one and rename one of the replacements in waiting. Saving, copying and renaming must be done with Firefox down, of course.