If you want to sync additional prefs then you can create a corresponding sync pref yourself and set the value to true.

• services.sync.prefs.sync.*

There are services.sync.prefs prefs related to set which prefs to sync and you can set the corresponding services.sync.prefs.sync.xxx pref to false to prevent syncing a pref.

Thank you for your reply.

I'm trying to create booleans values ​​"services.sync.prefs.sync.extensions.prefs" & "services.sync.prefs.sync.scripts" and set to "true", but they doesn't work.

Answer too vague, and doesn't solve the problem.

For me, I think no solution yet really exists on this topic, I hope it will give ideas to developers ...

This pref is the "master" for turning Sync on / off for Greasemonkey.
services.sync.prefs.sync.extensions.greasemonkey.sync.enabled

services.sync.prefs.sync.extensions.greasemonkey.
will show you all the prefs for GM and Sync services.

GM 1.15 did not sync GM scripts for me, but none of my user scripts have an update or source URL - so that might be the problem for me.

I don't think that the sync for for GM User Scripts is completely enabled yet.
https://github.com/greasemonkey/greasemonkey/issues/1573
The latest issue (as of 2 months ago) was a conflict with the master password dialog showing up during browser start up, which appeared in GM 1.13.

You need to append the full name of an existing pref as seen on the about:config page (i.e. prefix the pref with services.sync.prefs.sync.) to include this pref in syncing prefs.

Hi, something has changed.

Like I said, preference services.sync.prefs.sync.extensions.greasemonkey.sync.enabled was well true and nothing changed anything ...

But I found preference extensions.greasemonkey.sync.enabled and went to true, and there appeared three preferences : extensions.greasemonkey.sync.enabled.lastSync, extensions.greasemonkey.sync.enabled.lastSyncLocal and extensions.greasemonkey.sync.enabled.syncID.

Without the prefix services.sync.prefs.sync. ...

And since, the Scripts are included in the synchronization. However, no preferences extensions ("NoScript" for example). So, wonderful anyway.