How to force blocked objects dialog to reappear?

[nonscribe]

I do not like site by site blocking of things, because I the sites I like & need to permit to do some things are also trying to autoplay videos and replace images in a visually distracting way. I want to permit the things I need (clicking ALL on the right side of the section listing on nytimes.com header so I can access sections not listed across the top) without allowing all this page (because I don't want videos to play and images to be replaced etc). I am not sure how it works but I have better results with the 'blocked objects' submenu under the S symbol at the left of my FF window than I do with allowing site by site.

But: sometimes I do not see blocked objects option on that dropdown menu at all; and sometimes it appears, but after I select one item, it disappears and I can't ever get it to appear again for that page.

What is with this behavior of sometimes appearing, then disappearing, and sometimes not appearing at all?

[Thrawn]

The Blocked Objects submenu doesn't provide options to forbid things (or permanently allow them); once you've allowed an object, it won't appear on the menu any more.

If you revoke the temporary permissions, it should come back.