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Firefox will not open, error says XML parsing error:not well formed... It's also been crashing for a while.

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I've made no changed to any settings, I was browsing, closed it, realized I forgot to do something, reopened it and it opens a small box that says; XML parsing error: not well-formed Location: chrome://browser/content/browser.xul Line number 808, column 66:

And then in red it says; oncommand="InLineSpellCheckerUI.toggleEnabled() ;&/>