ReferenceError: GM_getValue is not defined

Why is this?

An error occurred “GM_getValue is not defined” , Can be solved?

Script doesn't work in Fx57+GM4. Alas, I can't fix it.
They say, my script works in Tampermonkey.

It seems broken with Chrome + Tampermonkey..

Script doesn't work in Fx57+GM4. Alas, I can't fix it.
They say, my script works in Tampermonkey.

It seems broken with Chrome + Tampermonkey..

Thank you for your answer.

It seems broken with Chrome + Tampermonkey..

The script is downgraded . Hope it'll work everywhere except GM4
if they shot to its leg, who am I to heal them?

Now it rework with Chrome and Tampermonkey :smile:
Thanks!
Ps:
It seems the update process don't work after your downgrade:
I ask to update my userscript in tempermonkey, but it don't find any change .
So , i need to remove your script and reinstall it...