I created a user.js that incorporates https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections and other tweaks, yet Firefox for Android still attempts to connect to several addresses that appear to be Mozilla updates related (63.245.217.* aus4.mozilla.org). Review of about:config confirms user.js was recognized. user.js: http://pastie.org/private/syyzqotsooclhwnuoxqo7w Firefox for Android version 41.0. Does anyone know of another tweak I should make that could solve this? If this isn't solved here, where should I try next? Note: I'm not suspecting something nefarious. The merits of that particular user.js are out of scope for this question. This is just for establishing a baseline where no connections are made without user consent and not for regular use. This question has been posted at the following locations, with no solutions. https://support.mozilla.org/en-US/questions/1088951 http://forums.mozillazine.org/viewtopic.php?f=47&t=2968493 http://android.stackexchange.com/questions/126168/firefox-for-android-mysterious-connections-after-turning-everything-off-in-setti https://www.reddit.com/r/firefox/comments/3q77a5/where_can_i_get_a_reply_to_this_question_about/