Are you talking about the inbuilt Firefox pop-up message boxes such as those that ask if you want to save a login or update Firefox, or website message boxes such as those that ask for cookie permissions?

Pressing ESC worked for me when I tried it with an inbuilt 'do you want to update the login' box.

I think website messages might need an extension. I use: https://addons.mozilla.org/en-GB/firefox/addon/behind-the-overlay-revival/

Usually such dialogs are anchored to a button in the address bar and you can click this icon to dismiss and possibly set a temporary permission.

Sometimes I accidentally hit the microphone icon, instead of the magnifying glass, on the search bar on Youtube. I just want to back out of the results of that, I don't want any block/allow decision to be made. Not at all. Not even temporarily.

Today I accidentally hit the mic thing again, and I hit the x on the box that appeared in the Youtube page to dismiss the thing in the page. The thing Firefox shows sticks around even after I closed that, though, and I don't like that.

I'm not sure why it failed to do anything the last time it came up, and I tried it, but hitting Esc today, when the dialog appeared, was apparently treated as equivalent to hitting block, I guess? It seems to be, as clicking the mic icon in the address bar revealed it was blocked temporarily. I could x that off, but that's not really what I want. I guess I end up with a similar result to what I want eventually, but it includes steps I do not want. I don't want to block and then remove the block afterward to get back to normal. I just want to skip back to the way it was immediately before I hit that microphone thing, as if it never happened. Not blocking and unblocking, just skipping it. To just make the dialog go away with no decision. Not blocking, not allowing, exiting.

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot