It's not specifically a problem with NoScript, it's a problem with any extension in Firefox that blocks or "turns off" scripts. The only solution I've found is to disable JavaScript in the browser settings (which, funny enough, works even with NoScript also enabled); note that while I'm doing this, NoScript is absolutely useless and allowing scripts on other sites requires re-enabling JavaScript in the settings. I don't know for sure if it's a problem with Xenforo or Firefox, but something is broken and I don't know what, so I'm not at a vantage point to fix it.
In fact this is a serious problem because while Abrowser offers a checkbox on a special page, standard Firefox doesn't offer a visible option; disabling JavaScript is only possible through about:config and Mozilla actually recommends using an extension such as NoScript to turn JavaScript off. So as it stands, on Firefox at least, most users who turn JavaScript off will find that they are unable to post consistently here, despite the fact that the forum software actually offers very good no-JS support and works just fine with JavaScript disabled.
If I was in your position, I would open a support request with Xenforo about this. Not so much for my sake (I keep JavaScript off most places, and Abrowser offers an easy way to toggle the actual JS setting, so this is only a minor inconvenience for me), but for the sake of other potential users. The Xenforo support should be able to figure out if it's a bug in Xenforo or Firefox.