This has been covered several times including reverse engineering of the code. The list of extensions they check for doesn’t include common extensions like ad blockers. It’s exclusively full of LinkedIn spamming and scraping type of extensions.

They also logically don’t need to fingerprint these users because those people are literally logging in to an account with their credentials.

By all appearances they’re just trying to detect people who are using spam automation and scraping extensions, which honestly I’m not too upset about.

If you never install a LinkedIn scraper or post generator extension you wouldn’t hit any of the extensions in the list they check for, last time I looked.