From ca0c6e779614ac02ba2dcc3d021ce45200ad2172 Mon Sep 17 00:00:00 2001
From: "J. Ryan Stinnett" <jryans@gmail.com>
Date: Fri, 24 Feb 2017 14:36:05 -0600
Subject: [PATCH] Bug 1342490 - DevTools users are temporarily qualified for
 e10s. r=Felipe

MozReview-Commit-ID: 4CZgSMcF1NT

--HG--
extra : rebase_source : 87f0329ada490bf47f7656319e5624580496d27f
---
 browser/extensions/e10srollout/bootstrap.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/browser/extensions/e10srollout/bootstrap.js b/browser/extensions/e10srollout/bootstrap.js
index 96d2d441bf37..2d6e1a32927f 100644
--- a/browser/extensions/e10srollout/bootstrap.js
+++ b/browser/extensions/e10srollout/bootstrap.js
@@ -186,5 +186,15 @@ function getTemporaryDisqualification() {
  * string must be returned.
  */
 function getTemporaryQualification() {
+  // Whenever the DevTools toolbox is opened for the first time in a release, it
+  // records this fact in the following pref as part of the DevTools telemetry
+  // system.  If this pref is set, then it means the user has opened DevTools at
+  // some point in time.
+  const PREF_OPENED_DEVTOOLS = "devtools.telemetry.tools.opened.version";
+  let hasOpenedDevTools = Preferences.isSet(PREF_OPENED_DEVTOOLS);
+  if (hasOpenedDevTools) {
+    return "devtools";
+  }
+
   return "";
 }