How can I access Advanced Javascript Settings?

I'm aware that, in recent versions of Firefox, the ability to disable Javascript has been removed. I don't intend to re-open discussion of that particular decision. But removing that option has also removed access to the Advanced Javascript Settings menu, which was far more useful than simply disabling Javascript itself. For example, although I rarely disabled Javascript entirely (other than when debugging my own site), I routinely disabled the ability of websites to disable context menus or to move and resize pop-up windows.
Unlike disabling Javascript entirely, these are settings which provide a positive benefit for "ordinary" (non-developer) users. If, say, I want to open a link in a new tab, then the correct way to do that is to right-click on it. Sites which disable right-click degrade the user experience, and allowing a way to override that is a good thing. Whatever the justification for removing the ability to disable Javascript entirely (and I do understand it, even if I don't agree with it), I can't see any justification for removing access to these advanced settings.
So my question is, how can I re-enable access to the Advaned javascript Settings? I can't see any obvious setting for it in about:config, and simply disabling javascript entirely via that method isn't what I want to do.

The href value javascript:void(0) is a placeholder to be shown when you hover a link, so you can see that this is not a normal link.<br />
The actual action is done via an onclick handler that is tied to the button (link), so if this isn't working then this can be caused by a script that didn't run properly to add this onclick action to the button or that JavaScript is blocked on that website possibly by an extension.
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Note that there is also security software that can block pop-ups and JavaScript, so check that as well.
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if that helps.

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