Bug 995417 causes gecko to crash if it tries to connect to an external host while running mochitests. This is good, but the remote JS debugger still attempts to contact the update servers, triggering the crash. This eventually crashes: ./mach mochitest-plain --jsdebugger foo

PSA: Use mach mochitest instead of mochitest-plain (it knows what the test flavors are)

(In reply to Gregory Szorc [:gps] from comment #1) > PSA: Use mach mochitest instead of mochitest-plain (it knows what the test > flavors are) That doesn't work for me, is it that new?

More information: 243 INFO FATAL ERROR: Non-local network connections are disabled and a connection attempt to aus4.mozilla.org (63.245.217.219) was made. about:config shows the following entries containing 'aus4': app.update.certs.1.commonName;aus4.mozilla.org app.update.certs.2.commonName;aus4.mozilla.org app.update.url;https://aus4.mozilla.org/update/3/%PRODUCT%/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/%OS_VERSION%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/update.xml media.gmp-manager.certs.1.commonName;aus4.mozilla.org media.gmp-manager.certs.2.commonName;aus4.mozilla.org media.gmp-manager.url;https://aus4.mozilla.org/update/3/GMP/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/%OS_VERSION%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/update.xml

106 INFO FATAL ERROR: Non-local network connections are disabled and a connection attempt to tiles.up.mozillalabs.com (2406:da00:ff00::4b65:a18f) was made. Every. Single. Time.

Sounds like the jsdebugger isn't using prefs_general.js correctly (which have the appropriate prefs already stubbed out). That sounds like a better fix than anything related to bug 1049688.