FYI - I tired this extension. I didn't like the page it created in the admin, because it won't work for me due to where my analytics is hosted and security settings. So, I tried messing with some code to remove the analytics page, that failed and broke my admin. I started getting the site could not fully load error. Then, I put the code back the way it was, still, site could not fully load. Then I composer removed the extension. Still site could not fully load. I did php flarum cache:clear, emptied browser cache, emptied CloudFlare cache. Still admin dashboard wouldn't load. Browser's console said it was because the site was still trying to load the analytics page. But, the extension was fully gone at this point and I had empited all caches ad nauseam. It's something about the admin.js... I just could not get it to flush.
I ended up putting debug mode on temporarily, which forces fresh js to load. So, now I'm good.
I guess my only point is... watch out if you install this extension... it seems to add js in such a way that it's hard to uninstall. I never have issues removing other extensions and clearing caches.
I wonder if it has to do with webpack? I saw webpack in the code.