I have already installed the script from the Github and I also run the 2. script (generated to ~/.local/bin directory) with the "-x" option), but it doesn't work.

How can I fix the problem ?

I use Firefox 57 (Quantum) on Linux Mint Debian Edition with Xfce desktop environment. (The xdotool package was installed after first run of the sh file generated to ~/.local/bin directory. After that I run this script again with success.)

Can You help me with some tips / advices to make this addon workable on my system ? (If you give me a mail-address we could talk about that there.)
Thx.