Artur.dubovoy@gmail.com

Users/myname/documents desktop/oude firefoxgeg>340f28ds.dafault>extensions>artur.dubovoy@gmail.com
is the map that worries me.
In one of the forums I consulted artur.dubovoy is described as the developer of Youtube Video Downloader; in another forum there is a warning that artur dubovoy installed spyware or even a virus.
I already removed the Flash Video Downloader (Youtube downloader) but the artur.dubovoy@gmail.com remains.
Should I remove it and if yes, how?

Hello Hubert,
We are sorry to hear that. We kindly request you to follow the instructions provided below to remove the addons from your browser :
At the top of the Firefox window, click on the Firefox buttonOn the menu bar, click on the Tools menuAt the top of the Firefox window, click on the Tools menu, and then click Add-ons. …
In the Add-ons Manager tab, select the Extensions or Appearance panel.
Select the add-on you wish to remove.
Click the Remove button.