2 files changed, 3 insertions, 4 deletions
diff --git a/devtools/client/performance/performance-controller.js b/devtools/client/performance/performance-controller.js
index e47a0c401..4bd272f41 100644
--- a/devtools/client/performance/performance-controller.js
+++ b/devtools/client/performance/performance-controller.js
@@ -527,11 +527,10 @@ var PerformanceController = {
     if (flags.testing) {
       return { supported: true, enabled: true };
     }
-    let supported = system.constants.E10S_TESTING_ONLY;
     // This is only checked on tool startup -- requires a restart if
     // e10s subsequently enabled.
     let enabled = this._e10s;
-    return { supported, enabled };
+    return { supported: false, enabled };
   },
 
   /**
diff --git a/devtools/client/performance/test/browser_perf-recording-notices-05.js b/devtools/client/performance/test/browser_perf-recording-notices-05.js
index b6267470d..7a6b6b6b9 100644
--- a/devtools/client/performance/test/browser_perf-recording-notices-05.js
+++ b/devtools/client/performance/test/browser_perf-recording-notices-05.js
@@ -41,8 +41,8 @@ add_task(function* () {
   enabled = true;
   PerformanceController._setMultiprocessAttributes();
   ok($("#performance-view").getAttribute("e10s"), "",
-    "When e10s is enabled, but not supported, this probably means we no longer have " +
-    "E10S_TESTING_ONLY, and we have no e10s attribute.");
+    "When e10s is enabled, but not supported, this probably means we " +
+    "have no e10s attribute.");
 
   supported = true;
   enabled = true;