There are improvements to be made and features to be recreated but the effort going in to redeveloping Greasemonkey for webextensions is for me so far successful. Some quick modifications were required to scripts that I had utilizing per user options but other than that I've had no issues.

It works perfectly, and saves a lot of time.

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Good

Thanks for support 57 ~ wait for long time.~

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.