User Agent: Mozilla/5.0 (Windows NT 6.1; rv:26.0) Gecko/20100101 Firefox/26.0 (Beta/Release) Build ID: 20131205075310
Please give us more details steps to reproduce the issue you are seeing.
Your issue is a support request and so Bugzilla is not equipped to handle these kinds of requests. Tips: Try in Safe Mode - https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Try with new clean profile - https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data Check for Malware issue - https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware
Since the reporter didn't provide the requested information, I will mark this issue as RESOLVED INCOMPLETE. If you still encounter this problem, please feel free to reopen this bug, or file a new one.