I keep getting an error message when i click view headers. i am unable to view column headers and am unable to sort by sender.

erro message when i try to view full header (cannot view any header)

Assuming that you are referring to '''email''' ''(based upon your use of the word sender''), Firefox doesn't do email, it's strictly a web browser.
If you are using Firefox to access your mail, you are using "web-mail". You need to seek support from your service provider or a forum for that service.
If your problem is with Mozilla Thunderbird, see this forum for support.
[https://support.mozillamessaging.com/en-US/home] <br />
or this one <br />
[http://forums.mozillazine.org/viewforum.php?f=39]

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