I was forced to upgrade to GreaseMonkey 4.x with Firefox 56.0. My scripts stopped working. I wrote them, so I looked into fixing. I looked at the GreaseMonkey web site. I saw the general notice about the changes but could not find specifics. Didn't trust what I saw when I saw notes like "this script" hasn't been updated in years.

Fix up documentation. Provided example scripts with before and after changes.

Give warning if it doesn't work in Firefox 56. I tried Firefox 57, but that caused other problems for me.

Was able to turn off auto updated of GreasMonkey before downloading 3.17 version of GreaseMonkey. add ons > GreaseMonkey entry > more > click on off selector. See below for the link by Anonymous user e7bdbb to the download.

Robert
PS. There is snow on the ground as I write this :-(
PSS. FYI. Tampermonkey gave me a compile error on "for (var elmForm, i=0; elmForm=document.forms[i]; ++i)".

В один прекрасный день все сломалось. Непонятно, какие скрипты активны на какой странице, нет кнопки manage scripts, ни один скрипт не работает. Верните все, как было!!!
It was a dark and snowy night. The day couldn't get any worse, right? Where is my Manage scripts... button? Nothing works anymore! I can't get no heads, nor tails about which of my scripts are supposed to run on any particular site. All of them are displayed as active. The scripts that used to work just fine, they all stopped working. All of these damn ads are popping up EVERYWHERE! I'm close to a nervous breakdown, can't visit any of my favourite sites anymore without my eyes bleeding out. Damn it all and merry Christmas to ye all.

很优秀的插件，感谢作者！

Ha sempre lavorato bene per le mie necessità ma, dopo l'ultimo aggiornamento, purtroppo in automatico, non funzionave niente.
Ho ripristinato più volte ma poi tornava l'ultima versione.
Ora ho disattivato l'aggiornamento automatico e spero bene.
Purtroppo anche la nuova versione di firefox mi da problemi con le estensioni aggiunte.
Sono costretto, spesso, a rifiutare l'aggiornamento per evitare problemi di ripristino della vecchia versione

Se opportuno scriverò in inglese.

Ho disattivato, anche se sconsigliato, l'aggiornamentoautomatico di firefox

4.1 перестали работать скрипты

The latest versions 4.0 - 4.1 for firefox quantum doesn't work any more with my favoured script.

I've been using this for far too long, but this new version is totally screwed. For example if you change the @name tag of a script it won't update it in dropdown most of the times and it WON'T save it. Also if you add a @match clause after you changed it's name it won't save the script. This used to be an awesome add-on but right now is only an unusable add-on. Anyway thank you for your work keeping this alive.

I relly like and use it a lot, but since the last FF update and GM update, i can not manage to find my scripts. and none of them is working, i re install al of it and still not working. any sugestions?

It is clear and concise, thanks for the heads up, I look forward to the next Firefox update, thanks folks.

v4 fuked all scripts installed, time to move on to tampermonkey

For all of those leaving bad reviews about Greasemonkey 4, it only works properly with FF57+. If you are using FF56 or lower, use version 3.17 and do not update. If you got automatically updated and things got broken, you can reinstall the old version by following this link: https://addons.mozilla.org/firefox/downloads/file/736199/greasemonkey-3.17-fx.xpi?src=version-history . Once back on 3.17, make sure you go immediately into the add-ons manager and turn off automatic updates for this extension. Anthony, you may want to put this info up front on AMO.

fk 4.1

hh

Scripts are no longer listed under addons in 4.1
I do not know how to keep scripts updated now

The new version is absolute garbage. It updated on me just now and I lost all of my scripts. The exact same thing happened to Stylish!

So, I turned off automatic updates for Greasemonkey and installed version 3.17 and now everything is fine. I did a very similar thing for Stylish and that worked as well.

I will be avoiding all new versions of Greasemonkey.

All I think is its just amazing app..

4.x is as useless as Firefox 57.