--- a/js/xpconnect/src/XPCJSRuntime.cpp
+++ b/js/xpconnect/src/XPCJSRuntime.cpp
@@ -1439,18 +1439,21 @@ XPCJSRuntime::InterruptCallback(JSContex
     if (!chrome && !self->mTimeoutAccumulated) {
       uint32_t delay = uint32_t(self->mSlowScriptActualWait.ToMilliseconds() - (limit * 1000.0));
       Telemetry::Accumulate(Telemetry::SLOW_SCRIPT_NOTIFY_DELAY, delay);
       self->mTimeoutAccumulated = true;
     }
 
     // Show the prompt to the user, and kill if requested.
     nsGlobalWindow::SlowScriptResponse response = win->ShowSlowScriptDialog();
-    if (response == nsGlobalWindow::KillSlowScript)
+    if (response == nsGlobalWindow::KillSlowScript) {
+        if (Preferences::GetBool("dom.global_stop_script", true))
+            xpc::Scriptability::Get(global).Block();
         return false;
+    }
 
     // The user chose to continue the script. Reset the timer, and disable this
     // machinery with a pref of the user opted out of future slow-script dialogs.
     if (response != nsGlobalWindow::ContinueSlowScriptAndKeepNotifying)
         self->mSlowScriptCheckpoint = TimeStamp::NowLoRes();
 
     if (response == nsGlobalWindow::AlwaysContinueSlowScript)
         Preferences::SetInt(prefName, 0);

--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -2644,16 +2644,19 @@ pref("gestures.enable_single_finger_inpu
 
 pref("editor.resizing.preserve_ratio",       true);
 pref("editor.positioning.offset",            0);
 
 pref("dom.use_watchdog", true);
 pref("dom.max_chrome_script_run_time", 20);
 pref("dom.max_script_run_time", 10);
 
+// Stop all scripts in a compartment when the "stop script" dialog is used.
+pref("dom.global_stop_script", true);
+
 // If true, ArchiveReader will be enabled
 pref("dom.archivereader.enabled", false);
 
 // Hang monitor timeout after which we kill the browser, in seconds
 // (0 is disabled)
 // Disabled on all platforms per bug 705748 until the found issues are
 // resolved.
 pref("hangmonitor.timeout", 0);