There is normally no need to disable this setting as all you need to do is to hold down the Shift key when right-clicking to get the Firefox context menu.

It's just an example. I'm looking for an answer to my actual question please.

This pref only has a global setting that is applied to all websites,. You may have guessed from my above reply that it is not possible to make such a pref work on a origin base like exceptions permit. You would have to use a second profile with the other setting for this pref and use that profile where you want to see the website context menu.

If I wanted guessing games, I would have played Jeopardy.

Next time you might try a more unambiguous "I don't know a way to do that.", Riddler.

Is there some way to enable and disable specific config settings , on a per-site basis? For example, let's say I want to disable right-click hijacking (dom.event.contextmenu.enabled) on https://thefifamobileapk.com/ turtlesaregreat.com, but use the default settings everywhere else. The Page Info > Permissions panel has some, but not all the ones I want. Is this somehow built into Firefox, or maybe there's an extension? Thanks. FF120 on Sonoma

While Firefox's built-in options are limited, extensions like "uMatrix" and "NoScript" offer fine-grained per-site control over various config settings, including JavaScript execution and right-click context menus. These let you block specific settings on sites like turtlesaregreat.com while keeping your preferred defaults elsewhere.