diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index 2eca8c957f05..10140f1df111 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -2041,7 +2041,7 @@ pref("devtools.markup.collapseAttributeLength", 120);
 pref("devtools.markup.beautifyOnCopy", false);
 // Whether or not the DOM mutation breakpoints context menu are enabled in the
 // markup view.
-pref("devtools.markup.mutationBreakpoints.enabled", false);
+pref("devtools.markup.mutationBreakpoints.enabled", true);
 
 // DevTools default color unit
 pref("devtools.defaultColorUnit", "authored");
diff --git a/devtools/client/preferences/debugger.js b/devtools/client/preferences/debugger.js
index 4d1d4de834b7..a21278e7cd4f 100644
--- a/devtools/client/preferences/debugger.js
+++ b/devtools/client/preferences/debugger.js
@@ -80,7 +80,7 @@ pref("devtools.debugger.features.map-expression-bindings", true);
 pref("devtools.debugger.features.xhr-breakpoints", true);
 pref("devtools.debugger.features.original-blackbox", true);
 pref("devtools.debugger.features.event-listeners-breakpoints", true);
-pref("devtools.debugger.features.dom-mutation-breakpoints", false);
+pref("devtools.debugger.features.dom-mutation-breakpoints", true);
 pref("devtools.debugger.features.log-points", true);
 pref("devtools.debugger.features.overlay-step-buttons", false);
 pref("devtools.debugger.features.inline-preview", false);