#17668 disabled support for "copy to clipboard" and "go to definition" context menu items in Firefox. 

Use cases

- [x] copy to clipboard (#17740)
- [x] jump to element node (blocked by Firefox bugs [1605597](https://bugzilla.mozilla.org/show_bug.cgi?id=1605597), [1609671](https://bugzilla.mozilla.org/show_bug.cgi?id=1609671), [1609677](https://bugzilla.mozilla.org/show_bug.cgi?id=1609677))
- [x] jump to function definition (blocked by Firefox bugs [1605597](https://bugzilla.mozilla.org/show_bug.cgi?id=1605597), [1609671](https://bugzilla.mozilla.org/show_bug.cgi?id=1609671), [1609677](https://bugzilla.mozilla.org/show_bug.cgi?id=1609677))
}
            currentPanel = panel;
            profilerPortalContainer = panel.container;
            if (profilerPortalContainer != null) {
              ensureInitialHTMLIsCleared(profilerPortalContainer);
              render('profiler');
              panel.injectStyles(cloneStyleTags);
            }
          });
        },
      );
      chrome.devtools.network.onNavigated.removeListener(checkPageForReact);
      // R
      chrome.devtools.network.onNavigated.addListener(function onNavigated() {
        // R
        // s
        syncSavedPreferences();
        // I
        // W
        flushSync(() => {
          root.unmount(() => {
            initBridgeAndStore();
          });
        });
      });
    },
  );
}
// Load (or reload) the DevTools extension when the user navigates to a new page.
function checkPageForReact() {