diff --git a/tools/lint/cpp/__init__.py b/tools/lint/cpp/__init__.py
index e69de29bb2d1..c580d191c1bf 100644
--- a/tools/lint/cpp/__init__.py
+++ b/tools/lint/cpp/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/lint/docs/conf.py b/tools/lint/docs/conf.py
index 31ebb6dcc9f9..e17a501e0cbf 100644
--- a/tools/lint/docs/conf.py
+++ b/tools/lint/docs/conf.py
@@ -1,3 +1,7 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
 # -*- coding: utf-8 -*-
 #
 # mozlint documentation build configuration file, created by
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
index c65323cb9877..7b1e73ecd28b 100644
--- a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 "use strict";
 
 /**
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/reporters/mozilla-format.js b/tools/lint/eslint/eslint-plugin-mozilla/reporters/mozilla-format.js
index 2ced0ccfbe87..885727e8aa46 100644
--- a/tools/lint/eslint/eslint-plugin-mozilla/reporters/mozilla-format.js
+++ b/tools/lint/eslint/eslint-plugin-mozilla/reporters/mozilla-format.js
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 /**
  * This file outputs the format that treeherder requires. If we integrate
  * these tests with ./mach, then we may replace this with a json handler within
diff --git a/tools/lint/python/__init__.py b/tools/lint/python/__init__.py
index e69de29bb2d1..c580d191c1bf 100644
--- a/tools/lint/python/__init__.py
+++ b/tools/lint/python/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/lint/wpt/__init__.py b/tools/lint/wpt/__init__.py
index e69de29bb2d1..c580d191c1bf 100644
--- a/tools/lint/wpt/__init__.py
+++ b/tools/lint/wpt/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/profiler/rust-helper/src/compact_symbol_table.rs b/tools/profiler/rust-helper/src/compact_symbol_table.rs
index 297aad3276f3..12c4ca081b1c 100644
--- a/tools/profiler/rust-helper/src/compact_symbol_table.rs
+++ b/tools/profiler/rust-helper/src/compact_symbol_table.rs
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 use std::collections::HashMap;
 use thin_vec::ThinVec;
 
diff --git a/tools/profiler/rust-helper/src/elf.rs b/tools/profiler/rust-helper/src/elf.rs
index f7f18125b6f9..d0d7f6e10370 100644
--- a/tools/profiler/rust-helper/src/elf.rs
+++ b/tools/profiler/rust-helper/src/elf.rs
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 use compact_symbol_table::CompactSymbolTable;
 use object::{ElfFile, Object, SymbolKind, Uuid};
 use std::collections::HashMap;
diff --git a/tools/profiler/rust-helper/src/lib.rs b/tools/profiler/rust-helper/src/lib.rs
index c792d80966ef..b9bc7b022e8a 100644
--- a/tools/profiler/rust-helper/src/lib.rs
+++ b/tools/profiler/rust-helper/src/lib.rs
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 extern crate memmap;
 extern crate thin_vec;
 
diff --git a/tools/quitter/background.js b/tools/quitter/background.js
index 685751a94adf..a915d953f993 100644
--- a/tools/quitter/background.js
+++ b/tools/quitter/background.js
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 "use strict";
 
 /* eslint-env webextensions */
diff --git a/tools/quitter/parent.js b/tools/quitter/parent.js
index a0e9cf0ad24f..a79583c3d488 100644
--- a/tools/quitter/parent.js
+++ b/tools/quitter/parent.js
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 "use strict";
 
 /* globals ExtensionAPI */
diff --git a/tools/tryselect/__init__.py b/tools/tryselect/__init__.py
index e69de29bb2d1..c580d191c1bf 100644
--- a/tools/tryselect/__init__.py
+++ b/tools/tryselect/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/tryselect/selectors/__init__.py b/tools/tryselect/selectors/__init__.py
index e69de29bb2d1..c580d191c1bf 100644
--- a/tools/tryselect/selectors/__init__.py
+++ b/tools/tryselect/selectors/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/tryselect/selectors/chooser/static/filter.js b/tools/tryselect/selectors/chooser/static/filter.js
index 5b7775e4eaaa..132372665b44 100644
--- a/tools/tryselect/selectors/chooser/static/filter.js
+++ b/tools/tryselect/selectors/chooser/static/filter.js
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 const selection = $("#selection")[0];
 const count = $("#selection-count")[0];
 const pluralize = (count, noun, suffix = "s") =>
diff --git a/tools/tryselect/selectors/chooser/static/select.js b/tools/tryselect/selectors/chooser/static/select.js
index dcb04111a1f6..439f9794576d 100644
--- a/tools/tryselect/selectors/chooser/static/select.js
+++ b/tools/tryselect/selectors/chooser/static/select.js
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 const labels = $("label.multiselect");
 const boxes = $("label.multiselect input:checkbox");
 var lastChecked = {};
diff --git a/tools/tryselect/selectors/chooser/templates/chooser.html b/tools/tryselect/selectors/chooser/templates/chooser.html
index 9f989ad8dabb..d89870ac776b 100644
--- a/tools/tryselect/selectors/chooser/templates/chooser.html
+++ b/tools/tryselect/selectors/chooser/templates/chooser.html
@@ -1,3 +1,7 @@
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this file,
+   - You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
 {% extends 'layout.html' %}
 {% block content %}
 <div class="container-fluid">
diff --git a/tools/tryselect/selectors/chooser/templates/close.html b/tools/tryselect/selectors/chooser/templates/close.html
index 18ad5c6560de..622f9f38b2c8 100644
--- a/tools/tryselect/selectors/chooser/templates/close.html
+++ b/tools/tryselect/selectors/chooser/templates/close.html
@@ -1,3 +1,7 @@
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this file,
+   - You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
 {% extends 'layout.html' %}
 {% block content %}
 <div class="container-fluid">
diff --git a/tools/tryselect/selectors/chooser/templates/layout.html b/tools/tryselect/selectors/chooser/templates/layout.html
index f987422a1410..4dfd27b46b93 100644
--- a/tools/tryselect/selectors/chooser/templates/layout.html
+++ b/tools/tryselect/selectors/chooser/templates/layout.html
@@ -1,3 +1,7 @@
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this file,
+   - You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
 <html>
     <head>
         <meta charset="utf-8">
diff --git a/tools/tryselect/util/__init__.py b/tools/tryselect/util/__init__.py
index e69de29bb2d1..c580d191c1bf 100644
--- a/tools/tryselect/util/__init__.py
+++ b/tools/tryselect/util/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/update-verify/python/util/__init__.py b/tools/update-verify/python/util/__init__.py
index e69de29bb2d1..c580d191c1bf 100644
--- a/tools/update-verify/python/util/__init__.py
+++ b/tools/update-verify/python/util/__init__.py
@@ -0,0 +1,3 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
diff --git a/tools/update-verify/python/util/commands.py b/tools/update-verify/python/util/commands.py
index b280189e4ecb..bd6ce4116b78 100644
--- a/tools/update-verify/python/util/commands.py
+++ b/tools/update-verify/python/util/commands.py
@@ -1,3 +1,7 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
 """Functions for running commands"""
 
 from __future__ import absolute_import, print_function
diff --git a/tools/update-verify/release/compare-directories.py b/tools/update-verify/release/compare-directories.py
index 253fba83a8ee..e56f99e1a6ff 100755
--- a/tools/update-verify/release/compare-directories.py
+++ b/tools/update-verify/release/compare-directories.py
@@ -1,4 +1,7 @@
 #! /usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
 
 from __future__ import absolute_import, print_function
 
diff --git a/tools/update-verify/release/replace-updater-certs.py b/tools/update-verify/release/replace-updater-certs.py
index b2a7afd584d0..668cacb7e60b 100755
--- a/tools/update-verify/release/replace-updater-certs.py
+++ b/tools/update-verify/release/replace-updater-certs.py
@@ -1,3 +1,7 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
 from __future__ import absolute_import, print_function
 
 import os.path
diff --git a/tools/update-verify/scripts/chunked-verify.py b/tools/update-verify/scripts/chunked-verify.py
index 0806af839474..8a01b0c1bcb5 100644
--- a/tools/update-verify/scripts/chunked-verify.py
+++ b/tools/update-verify/scripts/chunked-verify.py
@@ -1,4 +1,7 @@
 #!/usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
 
 from __future__ import absolute_import, print_function