@Phillip Cazzola
thank for the comment.
However I am still confused.
I have some scripts with lots of GM_addStyle() statements.
According to webpage
http://www.greasespot.net/ there is ", there is
no support for GM_addStyle".
On the other side it is written: "In general these methods work like their old counterparts, but their return values are
Promises"
Hmm, so when I re-write a (formerly working) script to
....
// @grant GM.addStyle
...
GM.addStyle("#foobarid { font-size: 16px !important;");
it does still not work.
How do I have to adjust the script otherwise to be v4.0 compatible?
Ben