Attempt to use headless mode with non-native widgets. Breaks WebGL; what else?

jld · jld · commit 6247d21d0eab · 2020-05-05T08:45:43.000-06:00
diff --git a/security/sandbox/linux/launch/SandboxLaunch.cpp b/security/sandbox/linux/launch/SandboxLaunch.cpp
@@ -332,6 +332,11 @@ void SandboxLaunchPrepare(GeckoProcessType aType,
                                false)) {
         flags |= CLONE_NEWUSER;
       }
+
+      if (Preferences::GetBool("widget.disable-native-theme-for-content")) {
+        aOptions->env_map["MOZ_HEADLESS"] = "1";
+      }
+
       break;
     default:
       // Nothing yet.
