The author of this is has some pretty ridiculous allegations, from blaming the browser for analytics on its homepage provider (when you can directly change the homepage to whatever you want right from the preferences without digging into about:config or elsewhere) to automatic updates, which is set to notify about them by default, not download and apply them. Firefox was(is?) known to install a separate updater service on Windows, FFS.
And he's complaining about NoScript, which doesn't play well with Pale Moon to the extent of destabilizing the browser and whose Pale Moon compatible XUL version is long abandoned by its developer while there's an alternative (eMatrix, forked from now abandoned uMatrix that was made by uBlock Origin's author) available. (https://forum.palemoon.org/viewtopic.php?f=46&t=17619)
Pale Moon is what Firefox used to be once upon a time in terms of customization and privacy before Mozilla became Google's controlled opposition to guard against browser monopoly allegations.
This article is 5 years old and I'm not sure whether it's accurate anymore, but might be worth checking to be sure we are completely private.
I also remember some drama about pale moon's author despising TOR and not wanting uBlock to work