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Hello pfoss,

Whatever your problem is, it just might be related to this suspicous looking add-on you have installed (according to your system details) : PrivateSearch 4.2

This add-on is not from the official addons.mozilla.org page .....

Unless you installed it yourself : it might be a good idea to remove it and run the malware scans that are listed in this article :

https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware