[ptx4]

In the end I decided to give RipMe project a try and stayed with it.
As long as you have Java installed, the plugin for given image host exists and images are in gallery, everything works marvelously.

Seemed simpler than deciding whether I trust JDownloader2 or setting up other Firefoxes and wondering if the ImageHostGrabber from it's current source can be trusted as well. But thanks for all the advices - might still come handy in the future.