Check if the Thunderbird autoconfig wizard trusts the result of DNS requests
Our design doc claims that Thunderbird trusts the result of DNS requests and we fix that, but I can't find how we do this.
I think something might have got lost along the way here: we used to have a patch for this, e.g. 3b437622ec44784fafb764071c34988213af2977 in our icedove.git.
We still had it in d9e6ba7978a685ea1a87cbc43e5a6279c6586e22 on the tails/stretch branch in our icedove.git.
We did not have it anymore in 2b0b9e0fd74b3de6841b3ef21a6f89c66f7a1c47, when I imported a patch series refreshed for v60. I think that's why I removed the corresponding pref in 5f2020524066458003022e77a23c8d9af05eb8b6 (#15091): the pref was not used anymore.
I'm wondering if back then, we've imported a patch series that was meant solely to generate patches that upstream might be fine with, but not meant for Tails. This dates back from #15091#note-24 where I had to guess what branch we should import, and I may have guessed wrong.
anonym, could you please check if we still need a patch (and lost it along the way)?