#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))
syncSavedPreferences();
  createPanelIfReactLoaded();
}
chrome.devtools.network.onNavigated.addListener(checkPageForReact);
// Check to see if React has loaded once per second in case React is added
// after page load
const loadCheckInterval = setInterval(function() {
  createPanelIfReactLoaded();
}, 1000);
createPanelIfReactLoaded();