diff --git a/browser/jsconfig.json b/browser/jsconfig.json
new file mode 100644
index 000000000000..ceb95a74b8a4
--- /dev/null
+++ b/browser/jsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../tools/@types/tsconfig.json",
+  "include": ["**/*.sys.mjs"]
+}
diff --git a/toolkit/components/extensions/types/globals.ts b/toolkit/components/extensions/types/globals.ts
index eae23ad57f61..ae2b5740809e 100644
--- a/toolkit/components/extensions/types/globals.ts
+++ b/toolkit/components/extensions/types/globals.ts
@@ -1,20 +1,3 @@
-/**
- * Gecko globals.
- */
-declare global {
-  const Cc: nsXPCComponents_Classes;
-  const Ci: nsIXPCComponents_Interfaces;
-  const Cr: nsIXPCComponents_Results;
-  const Components: nsIXPCComponents;
-
-  // Resolve typed generic overloads before the generated ones.
-  const Cu: nsXPCComponents_Utils & nsIXPCComponents_Utils;
-
-  const Glean: GleanImpl;
-  const GleanPings: GleanPingsImpl;
-  const Services: JSServices;
-  const uneval: (any) => string;
-}
 
 // Exports for all modules redirected here by a catch-all rule in tsconfig.json.
 export var
diff --git a/toolkit/jsconfig.json b/toolkit/jsconfig.json
new file mode 100644
index 000000000000..ceb95a74b8a4
--- /dev/null
+++ b/toolkit/jsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../tools/@types/tsconfig.json",
+  "include": ["**/*.sys.mjs"]
+}
diff --git a/toolkit/moz.build b/toolkit/moz.build
index e60f9c586bf3..fa9afa2e449b 100644
--- a/toolkit/moz.build
+++ b/toolkit/moz.build
@@ -94,6 +94,9 @@ with Files("mozapps/preferences/**"):
 with Files("l10n-registry.manifest"):
     BUG_COMPONENT = ("Core", "Localization")
 
+with Files("jsconfig.json"):
+    BUG_COMPONENT = ("Developer Infrastructure", "Lint and Formatting")
+
 GeneratedFile(
     "content/neterror/aboutNetErrorCodes.js",
     script="content/neterror/gen_aboutneterror_codes.py",
diff --git a/tools/@types/index.d.ts b/tools/@types/index.d.ts
index f796d64bf002..e1fc1c11e8c7 100644
--- a/tools/@types/index.d.ts
+++ b/tools/@types/index.d.ts
@@ -7,3 +7,21 @@
 /// <reference types="./lib.gecko.nsresult.d.ts" />
 /// <reference types="./lib.gecko.services.d.ts" />
 /// <reference types="./lib.gecko.xpcom.d.ts" />
+
+/// Order of references matters here, for overriding type signatures.
+/// <reference types="./lib.gecko.tweaks.d.ts" />
+
+declare global {
+  const Cc: nsXPCComponents_Classes;
+  const Ci: nsIXPCComponents_Interfaces;
+  const Components: nsIXPCComponents;
+  const Cr: nsIXPCComponents_Results;
+
+  // Resolve typed generic overloads before the generated ones.
+  const Cu: nsXPCComponents_Utils & nsIXPCComponents_Utils;
+
+  const Services: JSServices;
+  const uneval: (any) => string;
+}
+
+export {};
diff --git a/toolkit/components/extensions/types/gecko.ts b/tools/@types/lib.gecko.tweaks.d.ts
similarity index 94%
rename from toolkit/components/extensions/types/gecko.ts
rename to tools/@types/lib.gecko.tweaks.d.ts
index 720919d794d0..01e63a405ee9 100644
--- a/toolkit/components/extensions/types/gecko.ts
+++ b/tools/@types/lib.gecko.tweaks.d.ts
@@ -91,4 +91,7 @@ interface XULBrowserElement extends XULFrameElement, FrameLoader {
   remoteType: string;
 }
 
-type nsQIResult<iid> = import("gecko/lib.gecko.xpcom").nsQIResult<iid>;
+// https://github.com/microsoft/TypeScript-DOM-lib-generator/issues/1736
+interface Localization {
+  formatValuesSync(aKeys: L10nKey[]): (string | null)[];
+}
diff --git a/tools/@types/tsconfig.json b/tools/@types/tsconfig.json
new file mode 100644
index 000000000000..b39e1e0ea9aa
--- /dev/null
+++ b/tools/@types/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "noEmit": true,
+    "target": "es2022",
+    "types": ["gecko"]
+  }
+}
diff --git a/tools/moz.build b/tools/moz.build
index 041c99880086..eacddf0879b2 100644
--- a/tools/moz.build
+++ b/tools/moz.build
@@ -41,6 +41,9 @@ with Files("tryselect/**"):
 with Files("tryselect/selectors/release.py"):
     BUG_COMPONENT = ("Release Engineering", "General")
 
+with Files("ts/**"):
+    BUG_COMPONENT = ("Developer Infrastructure", "Lint and Formatting")
+
 with Files("update-packaging/**"):
     BUG_COMPONENT = ("Release Engineering", "General")