Hi, it isn't showing up in your System Details as a plugin, so check your extensions - Add-ons Manager (Cmd+Shift+A) > Extensions.

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Hi  !

Something tells me that you've got infected by malware, so would you please do this this :

Go to the 3-bar menu (or   'Tools') => Addons => Extensions And look for any unfamiliar or suspicious looking extensions

When you find any : remove them.

Do the same in your system's Control Panel

However :   most malware will be 'hiding' somewhere , so let's run malware scans :

Further information can be found in this article :
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

Run most or all of the listed malware scanners.
They all work differently   -   what one program doesn't pick up, the other might.

Also see : http://www.computips.org/remove-search-hmynewswire-co/

Especially for Mac : https://www.malwarebytes.com/mac/

I actually went to the website "News Wire" and selected not to use it. Then I was stuck with some add-on search engine called "Encrypt" or something similar. I wet to the add-on section in Firefox and deleted this one. Hopefully I will have not more problems for me downloading the plug-in or add-on.