Bug 1055759 - Add an extra config file for Thunderbird xpcshell tests, r=jlund.
Bug 1055759 - Add an extra config file for Thunderbird xpcshell tests, r=jlund.

--HG--
extra : rebase_source : f2ddcad4d8efff445c62bfde014130294c5bcce9
extra : amend_source : 6345eb683f3c5144ac254fe686d78d007b085402

simar7/build-mozharness,mozilla/build-mozharness,kartikgupta0909/mozilla-mozharness,lissyx/build-mozharness,kartikgupta0909/mozilla-mozharness,kartikgupta0909/build-mozharness,kartikgupta0909/gittest,mrrrgn/build-mozharness,mrrrgn/build-mozharness,kartikgupta0909/build-mozharness,mozilla/build-mozharness,walac/build-mozharness,lissyx/build-mozharness,walac/build-mozharness,kartikgupta0909/gittest,armenzg/build-mozharness,armenzg/build-mozharness,simar7/build-mozharness