#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))
if (panelCreated) {
    return;
  }
  chrome.devtools.inspectedWindow.eval(
    'window.__REACT_DEVTOOLS_GLOBAL_HOOK__ && window.__REACT_DEVTOOLS_GLOBAL_HOOK__.renderers.size > 0',
    function(pageHasReact, error) {
      if (!pageHasReact || panelCreated) {
        return;
      }
      panelCreated = true;
      clearInterval(loadCheckInterval);
      let bridge = null;
      let store = null;
      let profilingData = null;
      let componentsPortalContainer = null;
      let profilerPortalContainer = null;
      let cloneStyleTags = null;
      let mostRecentOverrideTab = null;
      let render = null;
      let root = null;
      const tabId = chrome.devtools.inspectedWindow.tabId;
      function initBridgeAndStore() {
        const port = chrome.runtime.connect({
          name: '' + tabId,
        });
        
        
        bridge = new Bridge({
          listen(fn) {