Upgraded to v4.0 now, it works with Firefox 57 beta. But when I clicked "edit" for one installed script, I can not find save button to save my modifications.

Upgraded to v4.0.
I can't write my own script now.I edit an installed script instead.
Scripts install page display with wrong coding with chinese.

Firstly thanks for launching Greasemonkey for Firefox 57. I have tried installing manual scripts on my browser it shows install but after clicking install screen disappears. I see no user scripts been added. Are there any alternate ways to install them.