Edits -
This quote from the article is interesting, especially considering Google the worlds biggest advertising industry company also has a browser.
"That Firefox is first and foremost a user-agent, not an industry-agent"
I believe that Mozilla can make progress in privacy,
but leadership needs to recognize that current advertising
practices that enable "free" content are in direct conflict
with security, privacy, stability, and performance concerns
-- and that Firefox is first and foremost a user-agent, not
an industry-agent.1) Firefox should be software that serves its computer user's interests.
2) The Mozilla corporation is pressured (to whatever degree) to turn Firefox into software that serves the entertainment and advertising and surveillance industry's interests.
3) Sometimes Mozilla bends to industry interests rather than user interests. This is a bad thing.
When you excerpted that quote, you changed the author's statement into:
"Firefox serves the interests of computer users, rather than industry titans."
Understand? :)
"[Mozilla's] leadership needs to recognize that current advertising practices that enable "free" content are in direct conflict with security, privacy, stability, and performance concerns..."
Not to be crass, but read between the lines. All statements have context. That one sits in the context of a world where browser makers have spent many years removing infoleaks from their browsers, much to the chagrin of advertisers and surveillers.
(In the same sense, I'm surprised that "incognito browsing" windows don't implicitly download a Tor "component" and route through it, the same way DRMed <video> elements implicitly download the Adobe DRM component.)
*In particular the information that you share with the exit node. Especially if you're not aware you're using Tor, it would be easy to share identifiable information.
That is, when I load some pages with tracking protection and ublock, the number of requests blocked by ublock is smaller (but still far from 0).
After looking at Firefox log, it doesn't seem this feature blocks anything that was not blocked by ublock. But this might be wrong, I only tested a few sites, and I have no idea about the internals of these tools.
More knowledgeable info would be appreciated.