Firefox + Greasemonkey: Settings menu not working

[mat926]

Firefox 84.0.1 64bit
I cannot open settings from the right-click menu and nothing happens. I tried disabling ad-blocker , disabling other extensions, and re-installing.

[Purfview]

Settings menu works with Greasemonkey and Waterfox, but for some reason doesn't on Firefox.
It works with Violentmonkey/Tampermonkey and all browsers I tested.

Maybe issue of:
greasemonkey/greasemonkey#3078

[poke]

This seems unrelated to the registerMenuCommand function because:

• Clicking the temporary button “Load Settings” will also do nothing (the button just disappears). So it is likely that just the GM_config.open() fails.
• The “unit test” for GM_config actually fails for me on GM4 too: https://openuserjs.org/scripts/sizzle/The_GM_config_Unit_Test

So I would suggest you to bring this up with the GM_config authors because apparently that doesn’t work with GM4.

[poke]

Yes, this is an issue with GM_config and GM4. The following code won’t work with GM4 at the moment:

var iframe = document.createElement('iframe');
iframe.src = 'about:blank';
document.body.appendChild(iframe);
iframe.addEventListener('load', function() {
    console.log('iframe.contentDocument', this.contentDocument); // this is null with GM4
});

But that’s what GM_config uses to render its config screen.

[Purfview]

Yes, this is an issue with GM_config and GM4. The following code won’t work with GM4 at the moment:

Strangely, GM_config and GM4 works on Waterfox Classic, GM3 works too.

[poke]

I can only assume that Waterfox doesn’t follow the same-origin rulings for contentDocument in the same way then. GM3 is a very different beast that has little to do with how GM4 works.

[Purfview]

Should be fixed now.
Thanks to @poke and @Martii.