Our custom extensions.torbutton.launch_warning is not honored
It’s set to true even though we’re trying to set it to false. Then, when
opening a download URL, we get a warning dialog that we want to hide
(especially since we set browser.download.forbid_open_with
to true).
Parent Task: #15023 (closed)
Original created by @intrigeri on 15707 (Redmine)