That's peanuts. LI's third-party bot prevention service, "protechts.net", took 42 GB RAM on my laptop with 32 GB the other day. Obviously found out because it got suspiciously slow and wheezing, and Firefox swapping like crazy seemed to be the culprit. Looking at its performance, this scare jump happened: [1].

I have to say I haven't spotted anything at this brutality scale neither before, not after this incident. Also, I had no third-party adblocking software deployed, just Firefox's native defaults. (I use quite a few other extensions, userscripts and userstyles, though, so I cannot rule out some clash induced by them.)

I see LI is using protechts.net stuff in hidden iframes with charming id="humanThirdPartyIframe" and even nicer id="humanSecurityEnforcerIframe". Lovely!

[1] https://pasteboard.co/9eDQ84szy3d9.jpg