diff --git a/browser/components/sessionstore/test/browser_522375.js b/browser/components/sessionstore/test/browser_522375.js
index 50b74d6cde3..f32c625235a 100644
--- a/browser/components/sessionstore/test/browser_522375.js
+++ b/browser/components/sessionstore/test/browser_522375.js
@@ -1,17 +1,7 @@
 function test() {
   var startup_info = Components.classes["@mozilla.org/toolkit/app-startup;1"].getService(Components.interfaces.nsIAppStartup).getStartupInfo();
   // No .process info on mac
-
-  // Check if we encountered a telemetry error for the the process creation
-  // timestamp and turn the first test into a known failure.
-  var telemetry = Cc["@mozilla.org/base/telemetry;1"].getService(Ci.nsITelemetry);
-  var snapshot = telemetry.getHistogramById("STARTUP_MEASUREMENT_ERRORS")
-                          .snapshot();
-
-  if (snapshot.counts[0] == 0)
-    ok(startup_info.process <= startup_info.main, "process created before main is run " + uneval(startup_info));
-  else
-    todo(false, "An error occurred while recording the process creation timestamp, skipping this test");
+  ok(startup_info.process <= startup_info.main, "process created before main is run " + uneval(startup_info));
 
   // on linux firstPaint can happen after everything is loaded (especially with remote X)
   if (startup_info.firstPaint)
diff --git a/toolkit/components/startup/nsAppStartup.cpp b/toolkit/components/startup/nsAppStartup.cpp
index 7ec9b825ea8..4656eaa9a8b 100644
--- a/toolkit/components/startup/nsAppStartup.cpp
+++ b/toolkit/components/startup/nsAppStartup.cpp
@@ -791,17 +791,14 @@ nsAppStartup::GetStartupInfo(JSContext* aCx, JS::Value* aRetval)
   PRTime ProcessCreationTimestamp = StartupTimeline::Get(StartupTimeline::PROCESS_CREATION);
 
   if (!ProcessCreationTimestamp) {
-    PRTime MainTimestamp = StartupTimeline::Get(StartupTimeline::MAIN);
     char *moz_app_restart = PR_GetEnv("MOZ_APP_RESTART");
     if (moz_app_restart) {
       ProcessCreationTimestamp = nsCRT::atoll(moz_app_restart) * PR_USEC_PER_MSEC;
     } else {
       ProcessCreationTimestamp = CalculateProcessCreationTimestamp();
     }
-    // Bug 670008 & 689256: Avoid obviously invalid process creation times
-    if ((PR_Now() <= ProcessCreationTimestamp) ||
-        (ProcessCreationTimestamp > MainTimestamp))
-    {
+    // Bug 670008: Avoid obviously invalid process creation times
+    if (PR_Now() <= ProcessCreationTimestamp) {
       ProcessCreationTimestamp = -1;
       Telemetry::Accumulate(Telemetry::STARTUP_MEASUREMENT_ERRORS, StartupTimeline::PROCESS_CREATION);
     }
diff --git a/toolkit/mozapps/extensions/test/browser/browser_addonrepository_performance.js b/toolkit/mozapps/extensions/test/browser/browser_addonrepository_performance.js
index 6ecf129c769..6f074c17c62 100644
--- a/toolkit/mozapps/extensions/test/browser/browser_addonrepository_performance.js
+++ b/toolkit/mozapps/extensions/test/browser/browser_addonrepository_performance.js
@@ -8,7 +8,6 @@ let tmp = {};
 Components.utils.import("resource://gre/modules/AddonRepository.jsm", tmp);
 let AddonRepository = tmp.AddonRepository;
 
-var gTelemetry = Cc["@mozilla.org/base/telemetry;1"].getService(Ci.nsITelemetry);
 var gManagerWindow;
 var gProvider;
 
@@ -42,38 +41,13 @@ function test() {
     }
     info(url.query);
 
-    // Check if we encountered telemetry errors and turn the tests for which
-    // we don't have valid data into known failures.
-    let snapshot = gTelemetry.getHistogramById("STARTUP_MEASUREMENT_ERRORS")
-                             .snapshot();
-
-    let tProcessValid = (snapshot.counts[0] == 0);
-    let tMainValid = tProcessValid && (snapshot.counts[2] == 0);
-    let tFirstPaintValid = tProcessValid && (snapshot.counts[5] == 0);
-    let tSessionRestoredValid = tProcessValid && (snapshot.counts[6] == 0);
-
     let params = parseParams(url.query);
 
     is(params.appOS, Services.appinfo.OS, "OS should be correct");
     is(params.appVersion, Services.appinfo.version, "Version should be correct");
-
-    if (tMainValid) {
-      ok(params.tMain >= 0, "Should be a sensible tMain");
-    } else {
-      todo(false, "An error occurred while recording the startup timestamps, skipping this test");
-    }
-
-    if (tFirstPaintValid) {
-      ok(params.tFirstPaint >= 0, "Should be a sensible tFirstPaint");
-    } else {
-      todo(false, "An error occurred while recording the startup timestamps, skipping this test");
-    }
-
-    if (tSessionRestoredValid) {
-      ok(params.tSessionRestored >= 0, "Should be a sensible tSessionRestored");
-    } else {
-      todo(false, "An error occurred while recording the startup timestamps, skipping this test");
-    }
+    ok(params.tMain >= 0, "Should be a sensible tMain");
+    ok(params.tFirstPaint >= 0, "Should be a sensible tFirstPaint");
+    ok(params.tSessionRestored >= 0, "Should be a sensible tSessionRestored");
 
     gSeenRequest = true;
   }