Did you confirm this? I tried a handful of different links, and it retained certain necessary parameters. Might depend on the link and how Firefox reads the link. Guessing it's using regex.
Tested New York Times, Bloomberg, Washington Post, and Nature, and they seemed to work (unlike the one built-in on Mastodon, which fails on all of those)
It however did not however strip all the tracking parameters - some of the stuff indicating that a link was shared by an Android user from the New York Times didn't get stripped off.
If there was a form to report exactly that or edit the list. The base of regexes needs a lot of rules unique to domains to be effective, like an adblock. And they obv put the most popular first.