Because it originates with the user, the user could refuse to grant it or revoke it.
The question for Mozilla is who are they accountable to?
These are not open source volunteers.
Mozilla can claim it is not a "for-profit" but its contributors are well-compensated, with salaries comparable to people working at the for-profit companies releasing web browsers. (Google Chrome was started by former Mozilla developers.)
"We are proudly non-profit, non-corporate and non-compromised."
Question: What makes Mozilla any more trustworthy to users than the other companies releasing web browsers?
Question: Why should they care about users any more than those companies?
Annual salaries from 2015 (reportable compensation from IRS Form 990):
Mitchell Baker, Chair $977,382 + $45,530
Bob Lisborne, Director $92,000
Mark Surman, Exec. Dir./President $170,699 + $40,602
Jim Cook, Treasurer $934,526 + $45,530
Angela Plohman, Secretary/VP Operations $121,322 + $30,342
Christopher Lawrence, VP Learning $153,492 + $62,538
An-Me Chung, Dir. Partnerships 154,946 + $72,672
Daniel Sinker, Dir. Partnerships 123,630 + $64,215
Hiram Paul Johnson, Marketing Lead 126,605 + 54, 903
Andrea Wood, Online Organizing/Fundraising Lead $135,048 + $46,322
Samuel Dyson, Director Hive Chicago $114,860 + $63,549
https://static.mozilla.com/moco/en-US/pdf/2015_Mozilla_Found...Question: How much of this comes from donations and how much comes (indirectly) from sale of advertising (by "partners")?
They get about half of their total revenue ($12,429,238) from licensing royalties ($6,466,566) according to the 2015 filing.
Question: Are there really any incentives to serve users in ways that the companies releasing web browsers do not? Users want the tracking to stop. Would Mozilla have disincentives to help users in this regard?
There is no "corruption" being implied by the above. It is legal to pay high salaries and not pay taxes.