diff --git a/js/xpconnect/src/XPCJSContext.cpp b/js/xpconnect/src/XPCJSContext.cpp
index de8ef2ee16d4..010c779f9bbd 100644
--- a/js/xpconnect/src/XPCJSContext.cpp
+++ b/js/xpconnect/src/XPCJSContext.cpp
@@ -840,15 +840,6 @@ static void LoadStartupJSPrefs(XPCJSContext* xpccx) {
       Preferences::GetBool(JS_OPTIONS_DOT_STR "jit.full_debug_checks");
 #endif
 
-  int32_t baselineInterpThreshold =
-      Preferences::GetInt(JS_OPTIONS_DOT_STR "blinterp.threshold", -1);
-  int32_t baselineThreshold =
-      Preferences::GetInt(JS_OPTIONS_DOT_STR "baselinejit.threshold", -1);
-  int32_t normalIonThreshold =
-      Preferences::GetInt(JS_OPTIONS_DOT_STR "ion.threshold", -1);
-  int32_t ionFrequentBailoutThreshold = Preferences::GetInt(
-      JS_OPTIONS_DOT_STR "ion.frequent_bailout_threshold", -1);
-
   bool spectreIndexMasking =
       Preferences::GetBool(JS_OPTIONS_DOT_STR "spectre.index_masking");
   bool spectreObjectMitigations =
@@ -899,14 +890,17 @@ static void LoadStartupJSPrefs(XPCJSContext* xpccx) {
 
   JS_SetGlobalJitCompilerOption(
       cx, JSJITCOMPILER_BASELINE_INTERPRETER_WARMUP_TRIGGER,
-      baselineInterpThreshold);
-  JS_SetGlobalJitCompilerOption(cx, JSJITCOMPILER_BASELINE_WARMUP_TRIGGER,
-                                baselineThreshold);
-  JS_SetGlobalJitCompilerOption(cx, JSJITCOMPILER_ION_NORMAL_WARMUP_TRIGGER,
-                                normalIonThreshold);
-  JS_SetGlobalJitCompilerOption(cx,
-                                JSJITCOMPILER_ION_FREQUENT_BAILOUT_THRESHOLD,
-                                ionFrequentBailoutThreshold);
+      StaticPrefs::javascript_options_blinterp_threshold_AtStartup());
+  JS_SetGlobalJitCompilerOption(
+      cx, JSJITCOMPILER_BASELINE_WARMUP_TRIGGER,
+      StaticPrefs::javascript_options_baselinejit_threshold_AtStartup());
+  JS_SetGlobalJitCompilerOption(
+      cx, JSJITCOMPILER_ION_NORMAL_WARMUP_TRIGGER,
+      StaticPrefs::javascript_options_ion_threshold_AtStartup());
+  JS_SetGlobalJitCompilerOption(
+      cx, JSJITCOMPILER_ION_FREQUENT_BAILOUT_THRESHOLD,
+      StaticPrefs::
+          javascript_options_ion_frequent_bailout_threshold_AtStartup());
 
 #ifdef DEBUG
   JS_SetGlobalJitCompilerOption(cx, JSJITCOMPILER_FULL_DEBUG_CHECKS,
diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index d2d57ab6b669..1a3cf01c5b8f 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -5336,6 +5336,34 @@
   value: true
   mirror: once
 
+# "Warm-up" thresholds at which we attempt to compile a script/function with
+# the next JIT tier.
+#
+# NOTE: These must match JitOptions defaults.
+- name: javascript.options.blinterp.threshold
+  type: int32_t
+  value: 10
+  mirror: once
+
+- name: javascript.options.baselinejit.threshold
+  type: int32_t
+  value: 100
+  mirror: once
+
+- name: javascript.options.ion.threshold
+  type: int32_t
+  value: 1500
+  mirror: once
+
+# Heuristic threshold for Warp/Ion to decide that too many bailouts are
+# happening and an IonScript should be discarded.
+#
+# NOTE: This must match JitOptions defaults.
+- name: javascript.options.ion.frequent_bailout_threshold
+  type: int32_t
+  value: 10
+  mirror: once
+
 - name: javascript.options.compact_on_user_inactive
   type: bool
   value: true
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 15d15c360b95..9cfb6986a43a 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1090,14 +1090,6 @@ pref("dom.event.contextmenu.enabled",       true);
 pref("dom.event.coalesce_mouse_move",       true);
 
 pref("javascript.enabled",                  true);
-// Duplicated in JitOptions - ensure both match.
-pref("javascript.options.blinterp.threshold", 10);
-// Duplicated in JitOptions - ensure both match.
-pref("javascript.options.baselinejit.threshold", 100);
-// Duplicated in JitOptions - ensure both match.
-pref("javascript.options.ion.threshold",    1500);
-// Duplicated in JitOptions - ensure both match.
-pref("javascript.options.ion.frequent_bailout_threshold", 10);
 pref("javascript.options.asmjs",                  true);
 pref("javascript.options.wasm",                   true);
 pref("javascript.options.wasm_trustedprincipals", true);