Hello, i noticed this bug that makes map-making impossible for me. I use firefox version 74.0, currently it is the newest one. I made a region that activates a trigger by pressing 'E' without any visible button or sound. I edited the trigger to open a movable, but before i did that i made a trigger action with producing sound. I clicked a simple sound effect from the list, but this message appeared. I started map-making using this browser yesterday and never got this warning. I can't choose anything from other lists, like which movable should move and to which region. The same message appears.
Thank you.
Sincerely
ziomke