Backed out changeset e97cfb1a3f88 (bug 1488951) by bhearsum`s request.

browser/base/content/test/trackingUI/browser_trackingUI_state.js

@@ -20,7 +20,6 @@ const TP_PREF = "privacy.trackingprotection.enabled";
 const TP_PB_PREF = "privacy.trackingprotection.pbmode.enabled";
 const FB_PREF = "browser.fastblock.enabled";
 const FB_TIMEOUT_PREF = "browser.fastblock.timeout";
-const FB_LIMIT_PREF = "browser.fastblock.limit";
 const TPC_PREF = "network.cookie.cookieBehavior";
 const BENIGN_PAGE = "http://tracking.example.org/browser/browser/base/content/test/trackingUI/benignPage.html";
 const TRACKING_PAGE = "http://tracking.example.org/browser/browser/base/content/test/trackingUI/trackingPage.html";
@@ -41,7 +40,6 @@ registerCleanupFunction(function() {
   Services.prefs.clearUserPref(CB_PREF);
   Services.prefs.clearUserPref(FB_PREF);
   Services.prefs.clearUserPref(FB_TIMEOUT_PREF);
-  Services.prefs.clearUserPref(FB_LIMIT_PREF);
   Services.prefs.clearUserPref(TPC_PREF);
 });
 
@@ -451,7 +449,6 @@ add_task(async function testFastBlock() {
 
   Services.prefs.setBoolPref(FB_PREF, true);
   Services.prefs.setIntPref(FB_TIMEOUT_PREF, 0);
-  Services.prefs.setIntPref(FB_LIMIT_PREF, 0);
   ok(FastBlock.enabled, "FB is enabled after setting the pref");
   Services.prefs.setBoolPref(CB_PREF, true);
   ok(ContentBlocking.enabled, "CB is enabled after setting the pref");
@@ -466,7 +463,6 @@ add_task(async function testFastBlock() {
 
   Services.prefs.clearUserPref(FB_PREF);
   Services.prefs.clearUserPref(FB_TIMEOUT_PREF);
-  Services.prefs.clearUserPref(FB_LIMIT_PREF);
   gBrowser.removeCurrentTab();
 });
 

modules/libpref/init/all.js

@@ -5868,17 +5868,11 @@ pref("general.document_open_conversion_depth_limit", 20);
 // documentElement and document.body are passive by default.
 pref("dom.event.default_to_passive_touch_listeners", true);
 
+// Enable FastBlock?
 pref("browser.fastblock.enabled", false);
-// The amount of time (ms) since navigation start after which all
+// The timeout (ms) since navigation start, all tracker connections been made
-// tracker connections will be cancelled.
+// after this timeout will be canceled.
 pref("browser.fastblock.timeout", 5000);
-// The amount of time (ms) since navigation start after which
-// we'll stop blocking tracker connections (0 = no limit).
-#ifdef NIGHTLY_BUILD
-pref("browser.fastblock.limit", 20000);
-#else
-pref("browser.fastblock.limit", 0);
-#endif
 
 // Enable clipboard readText() and writeText() by default
 pref("dom.events.asyncClipboard", true);

netwerk/protocol/http/nsHttpChannel.cpp

@@ -701,13 +701,11 @@ nsHttpChannel::CheckFastBlocked()
     static bool sFastBlockInited = false;
     static bool sIsFastBlockEnabled = false;
     static uint32_t sFastBlockTimeout = 0;
-    static uint32_t sFastBlockLimit = 0;
 
     if (!sFastBlockInited) {
         sFastBlockInited = true;
         Preferences::AddBoolVarCache(&sIsFastBlockEnabled, "browser.fastblock.enabled");
         Preferences::AddUintVarCache(&sFastBlockTimeout, "browser.fastblock.timeout");
-        Preferences::AddUintVarCache(&sFastBlockLimit, "browser.fastblock.limit");
     }
 
     TimeStamp timestamp;
@@ -729,20 +727,14 @@ nsHttpChannel::CheckFastBlocked()
     }
 
     TimeDuration duration = TimeStamp::NowLoRes() - timestamp;
-    bool hasFastBlockStarted = duration.ToMilliseconds() >= sFastBlockTimeout;
+    bool isFastBlocking = duration.ToMilliseconds() >= sFastBlockTimeout;
-    bool hasFastBlockStopped = false;
-    if ((sFastBlockLimit != 0) && (sFastBlockLimit > sFastBlockTimeout)) {
-        hasFastBlockStopped = duration.ToMilliseconds() > sFastBlockLimit;
-    }
-    const bool isFastBlocking = hasFastBlockStarted && !hasFastBlockStopped;
 
     if (isFastBlocking && mLoadInfo) {
         MOZ_ALWAYS_SUCCEEDS(mLoadInfo->SetIsTrackerBlocked(true));
     }
 
-    LOG(("FastBlock started=%d stopped=%d (%lf) [this=%p]\n",
+    LOG(("FastBlock %s (%lf) [this=%p]\n",
-         static_cast<int>(hasFastBlockStarted),
+         isFastBlocking ? "timeout" : "passed",
-         static_cast<int>(hasFastBlockStopped),
          duration.ToMilliseconds(),
          this));
     return isFastBlocking;