Bug 1432531 - Enable OMTP on linux. r=davidb

--HG--
extra : rebase_source : 685f614b56a0f76d5873d59c61a5b42e211ab8f5
extra : source : 47db0b85117f878991d655a396c0e066fc3662c1

modules/libpref/init/all.js

@@ -5804,7 +5804,7 @@ pref("toolkit.crashreporter.include_context_heap", true);
 // Open noopener links in a new process
 pref("dom.noopener.newprocess.enabled", true);
 
-#if defined(XP_WIN) || defined(XP_MACOSX)
+#if defined(XP_WIN) || defined(XP_MACOSX) || defined(XP_LINUX)
 pref("layers.omtp.enabled", true);
 #else
 pref("layers.omtp.enabled", false);