Bug 989109 - return isDebuggable using new async callback; r=wesj

--HG--
extra : rebase_source : 87056e2b1af8557f7e3cb5ad893b4b4067d6be4a
Bug 970213 - replace icon with custom design; r=wesj

--HG--
extra : rebase_source : 3c7ce023ecd8fd79b8cf0654f1e736a1997da1ab