when having a debug build with gtk2 instead of gtk3, the console gets spammed with literally thousands of thousands of warnings concerning dom.w3c_touch_events. there is alreay an upstream bug at https://bugzilla.mozilla.org/show_bug.cgi?id=1246854 and a patch which has been landed in the 47.x branch I don't feel comfortable to do the backport on my own, as the change made to modules/libpref/init/all.js gets rejected when patching due to a change of code. another way would be to edit gentoo-default-prefs accordingly thunderbird-45 beta is also affected.
Addressed in firefox-45.0.1 and will also be addressed in thunderbird-45.0_beta3 once released in a couple of days.
