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We tried to sync yahoo calendar with a blackberry and now Firefox does not open - just get a sync erro message?

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We attempted to sync yahoo calendar with a new blackberry curve. It already sees the yahoo email and contacts. Tried to do this through Yahoo - following their directions. How do we get into firefox to get to yahoo to undo what ever we did?

We attempted to sync yahoo calendar with a new blackberry curve. It already sees the yahoo email and contacts. Tried to do this through Yahoo - following their directions. How do we get into firefox to get to yahoo to undo what ever we did?

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Can you open Firefox in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode