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XUL Runner This profile was last used with a newer version of this application. Please create a new profile.

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"XUL Runner This profile was last used with a newer version of this application. Please create a new profile."

What's this? "XUL Runner This profile was last used with a newer version of this application. Please create a new profile."
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Hmm, your question duplicated. Let's continue here: https://support.mozilla.org/questions/1432959