Security Toolbar Disappeared from Firefox

The toolbar has disappeared again.  I'm running Firefox 42.0 on a Windows 7 machine.  I keep my system updated.  I ran a whole computer scan and the Casalemedia Tracking Cookie was removed.  I will uninstall and reinstall the toolbar as I did the other day but it seems there is something amiss.

Hello Elsa,
Please click on the following link http://download-toolbar.avg.com/partners/common/AVG%20Secure%20Search.exe to download the AVG Secure Search toolbar back on your browser. Please feel free to contact us for further assistance.
Thank you.

I have AVG Internet Security 2015.  It updated itself yesterday morning (12/12/2015 @ 4:05 AM EST).  After that update, my security toolbar in Firefox disappeared.  Has anyone else had this problem?  Can anyone tell me how to get it back?

Hello Elsa.

We certainly understand your concern. We have sent you an email instruction to get connected with our technical support team. Please follow those instructions to get in touch with them and you should be able to resolve your issue. Thank you.

Thank you.  That worked.  Any idea why the tool bar disappeared in the first place?

Hello Elsa,
Thank you for your kind post and for your support of AVG products. That's great to hear your issue has been resolved now. Some of the files might have got corrupted and that's the reason you might have faced the  Please feel free to contact us for further assistance. issue.
Thank you.
Hello Elsa,
Please try to uninstall the Secure Search toolbar through the control panel and once done please try to reinstall the AVG Secure Search program. Please follow the instructions on the article http://avgread.me/1KLkDpN to uninstall the AVG Secure search from your PC.
Thank you.