AF.XDOCK.CO not removable

Question

All searches via Firefox (Windows 10) were redirected via AF.XDOCK.CO.
Other browsers work normally.
After changing the default search engine from Yahoo! to Google, also Firefox isn't redirecting me anymore.
I have run UnHackMe and RegRun Standard several times, they don't detect any xdock malware, the same for other anti-malware programs.
Any experiences about the damage xdock can cause? Any further ideas for removing it? As I'm not the expert, I haven't tried the manual way so far.

Answer 1

I will help you!

1. Open UnHackMe,
2. Click the "Help in Removal" button on the main screen.
3. Choose "Send us RegRunLog".
4. Enter your e-mail, name, or nick.
5. Describe your problem.
6. Accept our Privacy Policy.
7. Click the "Upload" button.
   If you have any trouble with it, you can manually attach "regrunlog.txt" from your desktop and send us by e-mail to support@greatis.com.
   I will check your log and send you a solution as soon as possible.

https://greatis.com/unhackme/help/kb/removal/what-is-the-help-in-removal-service.htm