What was once an all-inclusive download is now a tedious bit-by-bit multiple downloads.

Unnecessarily complex to simply install an antivirus protection.

I tried to uninstall this add-on manually. I followed the steps that Firefox itself suggested. It keeps popping up and reinstalling itself! DO NOT INSTALL IT!!!

Edit:
So, this is how I solved my issue. After I manually uninstalled it, I restarted my computer. It was gone! Solved!