Watchdog is Anti Malware software. On the website Watchdog Development you can download a free trial of Watchdog. 
The trial installs very quickly on my system (Windows 10). I have scanned my computer with Watchdog and it found several plugins that i have installed in my browser. It also gave me the option to delete the plugins  (or browser hijacks) that I do not want to use anymore. (Like for example a plugin that gives Facebook it's old lay-out instead of the new modern lay-out). 
After you have selected the appropriate action you can automaticly erase those plugins from your system or for example report them as a safe plugin or browser hijack. You need to restart your computer after cleaning your system from the plugins or browser hijacks. 

From the developer:

Watchdog Anti-Malware is a second-layer, second-opinion cloud-based multi-engine malware scanner with real-time protection designed to protect your computer from malware that your primary anti-virus misses.