Site-specific permissions menu disappeared
Not disappeared actually, but it was whittled down so much it might as well have.
This is what it looks like in Firefox:
And this is what it looks like in Librewolf:
How do I get the good version back?
That Clear cookies and site data... button is only visible if there is data to clear. These screenshots indicate that searx.drgnz.club is not storing any data currently in Firefox, but startpage.com is storing some data in Librewolf - that is assuming that Librewolf also hides the item when there is no data.
I don't follow.
If you're trying to find the individual site-specific permissions, you need to choose the "Connection secure" item that you have a screenshot of, then "More information", then "Permissions". It's not at the top level in a menu, but in a dialog.
As far as I know, it's been there for ages.
If you open the spoiler, you'll see what I'm talking about. Firefox used to have one similar to Chrome, but now it's whittled down.