diff --git a/dom/bindings/test/TestCodeGen.webidl b/dom/bindings/test/TestCodeGen.webidl
index 4c353b72c49a..f338b07d432e 100644
--- a/dom/bindings/test/TestCodeGen.webidl
+++ b/dom/bindings/test/TestCodeGen.webidl
@@ -12,7 +12,7 @@ typedef CustomEventInit TestDictionaryTypedef;
 interface TestExternalInterface;
 
 // We need a pref name that's in StaticPrefList.h here.
-[Pref="abc.def"]
+[Pref="dom.webidl.test1"]
 interface TestRenamedInterface {
 };
 
@@ -899,63 +899,63 @@ interface TestInterface {
   void passVariadicThirdArg(DOMString arg1, long arg2, TestInterface... arg3);
 
   // Conditionally exposed methods/attributes
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   readonly attribute boolean prefable1;
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   readonly attribute boolean prefable2;
-  [Pref="ghi.jkl"]
+  [Pref="dom.webidl.test2"]
   readonly attribute boolean prefable3;
-  [Pref="ghi.jkl"]
+  [Pref="dom.webidl.test2"]
   readonly attribute boolean prefable4;
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   readonly attribute boolean prefable5;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable6;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable7;
-  [Pref="ghi.jkl", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test2", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable8;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable9;
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   void prefable10();
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   void prefable11();
-  [Pref="abc.def", Func="TestFuncControlledMember"]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   readonly attribute boolean prefable12;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   void prefable13();
-  [Pref="abc.def", Func="TestFuncControlledMember"]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   readonly attribute boolean prefable14;
   [Func="TestFuncControlledMember"]
   readonly attribute boolean prefable15;
   [Func="TestFuncControlledMember"]
   readonly attribute boolean prefable16;
-  [Pref="abc.def", Func="TestFuncControlledMember"]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   void prefable17();
   [Func="TestFuncControlledMember"]
   void prefable18();
   [Func="TestFuncControlledMember"]
   void prefable19();
-  [Pref="abc.def", Func="TestFuncControlledMember", ChromeOnly]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember", ChromeOnly]
   void prefable20();
 
   // Conditionally exposed methods/attributes involving [SecureContext]
   [SecureContext]
   readonly attribute boolean conditionalOnSecureContext1;
-  [SecureContext, Pref="abc.def"]
+  [SecureContext, Pref="dom.webidl.test1"]
   readonly attribute boolean conditionalOnSecureContext2;
-  [SecureContext, Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [SecureContext, Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean conditionalOnSecureContext3;
-  [SecureContext, Pref="abc.def", Func="TestFuncControlledMember"]
+  [SecureContext, Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   readonly attribute boolean conditionalOnSecureContext4;
   [SecureContext]
   void conditionalOnSecureContext5();
-  [SecureContext, Pref="abc.def"]
+  [SecureContext, Pref="dom.webidl.test1"]
   void conditionalOnSecureContext6();
-  [SecureContext, Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [SecureContext, Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   void conditionalOnSecureContext7();
-  [SecureContext, Pref="abc.def", Func="TestFuncControlledMember"]
+  [SecureContext, Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   void conditionalOnSecureContext8();
 
   // Miscellania
@@ -1221,9 +1221,9 @@ dictionary DictWithConditionalMembers {
   [ChromeOnly, Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   long chromeOnlyFuncControlledMember;
   // We need a pref name that's in StaticPrefList.h here.
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   long prefControlledMember;
-  [Pref="abc.def", ChromeOnly, Func="TestFuncControlledMember"]
+  [Pref="dom.webidl.test1", ChromeOnly, Func="TestFuncControlledMember"]
   long chromeOnlyFuncAndPrefControlledMember;
 };
 
diff --git a/dom/bindings/test/TestExampleGen.webidl b/dom/bindings/test/TestExampleGen.webidl
index 35b9908acbc6..f3f4fff2ffb3 100644
--- a/dom/bindings/test/TestExampleGen.webidl
+++ b/dom/bindings/test/TestExampleGen.webidl
@@ -705,39 +705,39 @@ interface TestExampleInterface {
   void passVariadicThirdArg(DOMString arg1, long arg2, TestInterface... arg3);
 
   // Conditionally exposed methods/attributes
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   readonly attribute boolean prefable1;
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   readonly attribute boolean prefable2;
-  [Pref="ghi.jkl"]
+  [Pref="dom.webidl.test2"]
   readonly attribute boolean prefable3;
-  [Pref="ghi.jkl"]
+  [Pref="dom.webidl.test2"]
   readonly attribute boolean prefable4;
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   readonly attribute boolean prefable5;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable6;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable7;
-  [Pref="ghi.jkl", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test2", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable8;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable9;
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   void prefable10();
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   void prefable11();
-  [Pref="abc.def", Func="TestFuncControlledMember"]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   readonly attribute boolean prefable12;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   void prefable13();
-  [Pref="abc.def", Func="TestFuncControlledMember"]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   readonly attribute boolean prefable14;
   [Func="TestFuncControlledMember"]
   readonly attribute boolean prefable15;
   [Func="TestFuncControlledMember"]
   readonly attribute boolean prefable16;
-  [Pref="abc.def", Func="TestFuncControlledMember"]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   void prefable17();
   [Func="TestFuncControlledMember"]
   void prefable18();
@@ -747,19 +747,19 @@ interface TestExampleInterface {
   // Conditionally exposed methods/attributes involving [SecureContext]
   [SecureContext]
   readonly attribute boolean conditionalOnSecureContext1;
-  [SecureContext, Pref="abc.def"]
+  [SecureContext, Pref="dom.webidl.test1"]
   readonly attribute boolean conditionalOnSecureContext2;
-  [SecureContext, Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [SecureContext, Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean conditionalOnSecureContext3;
-  [SecureContext, Pref="abc.def", Func="TestFuncControlledMember"]
+  [SecureContext, Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   readonly attribute boolean conditionalOnSecureContext4;
   [SecureContext]
   void conditionalOnSecureContext5();
-  [SecureContext, Pref="abc.def"]
+  [SecureContext, Pref="dom.webidl.test1"]
   void conditionalOnSecureContext6();
-  [SecureContext, Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [SecureContext, Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   void conditionalOnSecureContext7();
-  [SecureContext, Pref="abc.def", Func="TestFuncControlledMember"]
+  [SecureContext, Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   void conditionalOnSecureContext8();
 
   // Miscellania
diff --git a/dom/bindings/test/TestJSImplGen.webidl b/dom/bindings/test/TestJSImplGen.webidl
index fbd9a3c1c4f1..5b5ddd5f544a 100644
--- a/dom/bindings/test/TestJSImplGen.webidl
+++ b/dom/bindings/test/TestJSImplGen.webidl
@@ -723,63 +723,63 @@ interface TestJSImplInterface {
   void passVariadicThirdArg(DOMString arg1, long arg2, TestJSImplInterface... arg3);
 
   // Conditionally exposed methods/attributes
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   readonly attribute boolean prefable1;
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   readonly attribute boolean prefable2;
-  [Pref="ghi.jkl"]
+  [Pref="dom.webidl.test2"]
   readonly attribute boolean prefable3;
-  [Pref="ghi.jkl"]
+  [Pref="dom.webidl.test2"]
   readonly attribute boolean prefable4;
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   readonly attribute boolean prefable5;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable6;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable7;
-  [Pref="ghi.jkl", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test2", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable8;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean prefable9;
-  [Pref="abc.def"]
+  [Pref="dom.webidl.test1"]
   void prefable10();
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   void prefable11();
-  [Pref="abc.def", Func="TestFuncControlledMember"]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   readonly attribute boolean prefable12;
-  [Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   void prefable13();
-  [Pref="abc.def", Func="TestFuncControlledMember"]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   readonly attribute boolean prefable14;
   [Func="TestFuncControlledMember"]
   readonly attribute boolean prefable15;
   [Func="TestFuncControlledMember"]
   readonly attribute boolean prefable16;
-  [Pref="abc.def", Func="TestFuncControlledMember"]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   void prefable17();
   [Func="TestFuncControlledMember"]
   void prefable18();
   [Func="TestFuncControlledMember"]
   void prefable19();
-  [Pref="abc.def", Func="TestFuncControlledMember", ChromeOnly]
+  [Pref="dom.webidl.test1", Func="TestFuncControlledMember", ChromeOnly]
   void prefable20();
 
   // Conditionally exposed methods/attributes involving [SecureContext]
   [SecureContext]
   readonly attribute boolean conditionalOnSecureContext1;
-  [SecureContext, Pref="abc.def"]
+  [SecureContext, Pref="dom.webidl.test1"]
   readonly attribute boolean conditionalOnSecureContext2;
-  [SecureContext, Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [SecureContext, Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   readonly attribute boolean conditionalOnSecureContext3;
-  [SecureContext, Pref="abc.def", Func="TestFuncControlledMember"]
+  [SecureContext, Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   readonly attribute boolean conditionalOnSecureContext4;
   [SecureContext]
   void conditionalOnSecureContext5();
-  [SecureContext, Pref="abc.def"]
+  [SecureContext, Pref="dom.webidl.test1"]
   void conditionalOnSecureContext6();
-  [SecureContext, Pref="abc.def", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  [SecureContext, Pref="dom.webidl.test1", Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
   void conditionalOnSecureContext7();
-  [SecureContext, Pref="abc.def", Func="TestFuncControlledMember"]
+  [SecureContext, Pref="dom.webidl.test1", Func="TestFuncControlledMember"]
   void conditionalOnSecureContext8();
 
   // Miscellania
diff --git a/modules/libpref/init/StaticPrefList.h b/modules/libpref/init/StaticPrefList.h
index cc7e94267b5e..6a1b859ff908 100644
--- a/modules/libpref/init/StaticPrefList.h
+++ b/modules/libpref/init/StaticPrefList.h
@@ -2783,14 +2783,14 @@ VARCACHE_PREF(
 
 VARCACHE_PREF(
   Live,
-  "abc.def",
-  abc_def,
+  "dom.webidl.test1",
+  dom_webidl_test1,
   bool, true
 )
 VARCACHE_PREF(
   Live,
-  "ghi.jkl",
-  ghi_jkl,
+  "dom.webidl.test2",
+  dom_webidl_test2,
   bool, true
 )