Okay, I'll show you my settings, though the defaults are pretty restrictive. Basically an untrusted site has nothing checked, and the default I bounce around between enabling scripts and fonts. My monitor is big so you should enlarge the images by clicking the image linking to the postimg.cc site.
I used NoScript last night so I have a long list of untrusted sites. I like this extension. It's really informative.
Searching x.com with metager:

X opens from metager, no warning. I have the LibreWolf block cross-origin referrers checked:

long list of untrusted sites, mostly just the origin sites are trusted, maybe an img support site or two. Notice I don't even have metager in that list, it's running on the default setting:

Here are the Advanced settings with 'Sanitize cross site suspicious requests checked:

Here are the Trusted settings:

Here are the Default settings, in this shot I have unrestricted CSS enable to use color changer extension, but you can toggle that how you like:

And like I said, the Untrusted site settings have absolutely no boxes checked.
Hope that helps.