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

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() ;&/>
--------------------------------^

Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
Profile Backup and Restore
*http://kb.mozillazine.org/Profile_backup
*https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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