--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -301,26 +301,16 @@ int32_t gTimeoutCnt                     
 // The default shortest interval/timeout we permit
 #define DEFAULT_MIN_TIMEOUT_VALUE 4 // 4ms
 #define DEFAULT_MIN_BACKGROUND_TIMEOUT_VALUE 1000 // 1000ms
 static int32_t gMinTimeoutValue;
 static int32_t gMinBackgroundTimeoutValue;
 inline int32_t
 nsGlobalWindow::DOMMinTimeoutValue() const {
   bool isBackground = !mOuterWindow || mOuterWindow->IsBackground();
-  if (isBackground) {
-    // Don't use the background timeout value when there are audio contexts with
-    // active nodes, so that background audio can keep running smoothly.
-    for (const AudioContext* ctx : mAudioContexts) {
-      if (ctx->ActiveNodeCount() > 0) {
-        isBackground = false;
-        break;
-      }
-    }
-  }
   return
     std::max(isBackground ? gMinBackgroundTimeoutValue : gMinTimeoutValue, 0);
 }
 
 // The number of nested timeouts before we start clamping. HTML5 says 1, WebKit
 // uses 5.
 #define DOM_CLAMP_TIMEOUT_NESTING_LEVEL 5
 

--- a/dom/media/webaudio/AudioContext.cpp
+++ b/dom/media/webaudio/AudioContext.cpp
@@ -654,22 +654,16 @@ AudioContext::UpdatePannerSource()
 }
 
 uint32_t
 AudioContext::MaxChannelCount() const
 {
   return mIsOffline ? mNumberOfChannels : CubebUtils::MaxNumberOfChannels();
 }
 
-uint32_t
-AudioContext::ActiveNodeCount() const
-{
-  return mActiveNodes.Count();
-}
-
 MediaStreamGraph*
 AudioContext::Graph() const
 {
   return Destination()->Stream()->Graph();
 }
 
 MediaStream*
 AudioContext::DestinationStream() const

--- a/dom/media/webaudio/AudioContext.h
+++ b/dom/media/webaudio/AudioContext.h
@@ -289,18 +289,16 @@ public:
   void UnregisterActiveNode(AudioNode* aNode);
 
   void UnregisterAudioBufferSourceNode(AudioBufferSourceNode* aNode);
   void UnregisterPannerNode(PannerNode* aNode);
   void UpdatePannerSource();
 
   uint32_t MaxChannelCount() const;
 
-  uint32_t ActiveNodeCount() const;
-
   void Mute() const;
   void Unmute() const;
 
   JSObject* GetGlobalJSObject() const;
 
   AudioChannel MozAudioChannelType() const;
 
   AudioChannel TestAudioChannelInAudioNodeStream();

--- a/dom/media/webaudio/moz.build
+++ b/dom/media/webaudio/moz.build
@@ -10,20 +10,16 @@ with Files('*'):
 DIRS += ['blink']
 
 TEST_DIRS += ['compiledtest']
 
 MOCHITEST_MANIFESTS += [
     'test/mochitest.ini',
 ]
 
-BROWSER_CHROME_MANIFESTS += [
-    'test/browser.ini',
-]
-
 TEST_HARNESS_FILES.testing.mochitest.tests.dom.media.webaudio.test.blink += [
     'test/blink/audio-testing.js',
     'test/blink/convolution-testing.js',
     'test/blink/panner-model-testing.js',
 ]
 
 EXPORTS += [
     'AlignedTArray.h',

deleted file mode 100644
--- a/dom/media/webaudio/test/browser.ini
+++ /dev/null
@@ -1,1 +0,0 @@
-[browser_bug1181073.js]
\ No newline at end of file

deleted file mode 100644
--- a/dom/media/webaudio/test/browser_bug1181073.js
+++ /dev/null
@@ -1,65 +0,0 @@
-add_task(function*() {
-  // Make the min_background_timeout_value very high to avoid problems on slow machines
-  yield new Promise(resolve => SpecialPowers.pushPrefEnv({
-    'set': [['dom.min_background_timeout_value', 3000]]
-  }, resolve));
-
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, "https://example.com");
-  let browser = gBrowser.selectedBrowser;
-
-  // Make the tab a background tab, so that setInterval will be throttled.
-  yield BrowserTestUtils.openNewForegroundTab(gBrowser);
-
-  let time = yield ContentTask.spawn(browser, null, function () {
-    return new Promise(resolve => {
-      let start = content.performance.now();
-      let id = content.window.setInterval(function() {
-        let end = content.performance.now();
-        content.window.clearInterval(id);
-        resolve(end - start);
-      }, 0);
-    });
-  });
-
-  ok(time > 2000, "Interval is throttled with no webaudio (" + time + " ms)");
-
-  time = yield ContentTask.spawn(browser, null, function () {
-    return new Promise(resolve => {
-      // Start playing audio, save it on the window so it doesn't get GCed
-      let audioCtx = content.window.audioCtx = new content.window.AudioContext();
-      let oscillator = audioCtx.createOscillator();
-      oscillator.type = 'square';
-      oscillator.frequency.value = 3000;
-      oscillator.start();
-
-      let start = content.performance.now();
-      let id = content.window.setInterval(function() {
-        let end = content.performance.now();
-        content.window.clearInterval(id);
-        oscillator.stop();
-        resolve(end - start);
-      }, 0);
-    });
-  });
-
-  ok(time < 1000, "Interval is not throttled with audio playing (" + time + " ms)");
-
-  // Destroy the oscillator, but not the audio context
-  Cu.forceGC();
-
-  time = yield ContentTask.spawn(browser, null, function () {
-    return new Promise(resolve => {
-      let start = content.performance.now();
-      let id = content.window.setInterval(function() {
-        let end = content.performance.now();
-        content.window.clearInterval(id);
-        resolve(end - start);
-      }, 0);
-    });
-  });
-
-  ok(time > 2000, "Interval is throttled with audio stopped (" + time + " ms)");
-
-  while (gBrowser.tabs.length > 1)
-    gBrowser.removeCurrentTab();
-});