Components Drag&Drop is not working on Firefox 69.0.3

Hello,

I’m trying to make a test app using Thunkable and encountered a bug with Drag&Drop: yesterday I’ve put some object on my test app, but today I can’t Drag&Drop any components - when I click on a component it’s label disappears and not possible to drag.
Reloading page doesn’t help.
Check attached screenshot.
Screenshot_25

Hello,

I have in this version of Firefox everything works well. Yesterday this was a problem.