Created attachment 618683 [details] [diff] [review] Set the devtools.debugger.log pref in head_dbg.js, so we always get packet logs. The devtools.debugger.log pref enables various kinds of logging within the debugger, including logging the packets exchanged between client and server. This is really useful to see when a test has failed, and since runxpcshelltests.py doesn't show the output anyway unless the test does fail, head_dbg.js should simply set that pref unconditionally.
Backed out the latest fx-team merge whole-sale because of Ts regressions: https://hg.mozilla.org/mozilla-central/rev/b0200dab0ccc Please reland only after investigating and fixing the regression. Thanks!
I messed up and backed out the wrong range, sorry about that. I backed out my backout, so this is still on mozilla-central: https://hg.mozilla.org/mozilla-central/rev/dec5b367c421