[xjay]

Firefox could provide an opt-out flag.

[xjay]

A likely opt-out [1] mechanism that will prevent Firefox from enabling DoH in any future update.

5 means explicitly disabled. 0 (default) is whatever is considered default for now.

  1. about:config
  2. network.trr.mode = 5

[1] https://news.ycombinator.com/item?id=20373444