diff --git a/devtools/.eslintrc.js b/devtools/.eslintrc.js
index 9c89af1ea5bc..f565fd09b89b 100644
--- a/devtools/.eslintrc.js
+++ b/devtools/.eslintrc.js
@@ -133,7 +133,23 @@ module.exports = {
     "rules": {
       "mozilla/no-define-cc-etc": "off",
     }
-  }, ],
+  }, {
+    // All DevTools files should avoid relative paths.
+    "files": [
+      "**"
+    ],
+    "excludedFiles": [
+      // Debugger modules have a custom bundling logic which relies on relative
+      // paths.
+      "client/debugger/**",
+      // `client/shared/build` contains node helpers to build the debugger and
+      // not devtools modules.
+      "client/shared/build/**",
+    ],
+    "rules": {
+      "mozilla/reject-relative-requires": "error",
+    }
+  }],
   "rules": {
     // These are the rules that have been configured so far to match the
     // devtools coding style.
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/helpers.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/helpers.js
index a656aa3f8963..281d86e81c63 100644
--- a/tools/lint/eslint/eslint-plugin-mozilla/lib/helpers.js
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/helpers.js
@@ -810,4 +810,28 @@ module.exports = {
   getSavedRuleData(rule) {
     return require("./rules/saved-rules-data.json").rulesData[rule];
   },
+
+  /**
+   * Extract the path of require (and require-like) helpers used in DevTools.
+   */
+  getDevToolsRequirePath(node) {
+    if (
+      node.callee.type == "Identifier" &&
+      node.callee.name == "require" &&
+      node.arguments.length == 1 &&
+      node.arguments[0].type == "Literal"
+    ) {
+      return node.arguments[0].value;
+    } else if (
+      node.callee.type == "MemberExpression" &&
+      node.callee.property.type == "Identifier" &&
+      (node.callee.property.name == "lazyRequireGetter" ||
+        node.callee.property.name == "lazyImporter") &&
+      node.arguments.length >= 3 &&
+      node.arguments[2].type == "Literal"
+    ) {
+      return node.arguments[2].value;
+    }
+    return null;
+  },
 };
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/index.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/index.js
index 9d297db9b693..326ce56c9d66 100644
--- a/tools/lint/eslint/eslint-plugin-mozilla/lib/index.js
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/index.js
@@ -51,6 +51,7 @@ module.exports = {
     "no-useless-run-test": require("../lib/rules/no-useless-run-test"),
     "prefer-boolean-length-check": require("../lib/rules/prefer-boolean-length-check"),
     "reject-importGlobalProperties": require("../lib/rules/reject-importGlobalProperties"),
+    "reject-relative-requires": require("../lib/rules/reject-relative-requires"),
     "reject-some-requires": require("../lib/rules/reject-some-requires"),
     "rejects-requires-await": require("../lib/rules/rejects-requires-await"),
     "use-cc-etc": require("../lib/rules/use-cc-etc"),
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-relative-requires.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-relative-requires.js
new file mode 100644
index 000000000000..eb100b13fa9d
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-relative-requires.js
@@ -0,0 +1,34 @@
+/**
+ * @fileoverview Reject some uses of require.
+ *
+ * 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";
+
+// -----------------------------------------------------------------------------
+// Rule Definition
+// -----------------------------------------------------------------------------
+
+var helpers = require("../helpers");
+
+module.exports = function(context) {
+  // ---------------------------------------------------------------------------
+  // Public
+  //  --------------------------------------------------------------------------
+
+  const isRelativePath = function(path) {
+    return path.startsWith("./") || path.startsWith("../");
+  };
+
+  return {
+    CallExpression(node) {
+      const path = helpers.getDevToolsRequirePath(node);
+      if (path && isRelativePath(path)) {
+        context.report(node, "relative paths are not allowed with require()");
+      }
+    },
+  };
+};
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-some-requires.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-some-requires.js
index 5dff5da2d5d1..ab310692930c 100644
--- a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-some-requires.js
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/reject-some-requires.js
@@ -12,6 +12,8 @@
 // Rule Definition
 // -----------------------------------------------------------------------------
 
+var helpers = require("../helpers");
+
 module.exports = function(context) {
   // ---------------------------------------------------------------------------
   // Public
@@ -22,30 +24,11 @@ module.exports = function(context) {
   }
   const RX = new RegExp(context.options[0]);
 
-  const checkPath = function(node, path) {
-    if (RX.test(path)) {
-      context.report(node, `require(${path}) is not allowed`);
-    }
-  };
-
   return {
     CallExpression(node) {
-      if (
-        node.callee.type == "Identifier" &&
-        node.callee.name == "require" &&
-        node.arguments.length == 1 &&
-        node.arguments[0].type == "Literal"
-      ) {
-        checkPath(node, node.arguments[0].value);
-      } else if (
-        node.callee.type == "MemberExpression" &&
-        node.callee.property.type == "Identifier" &&
-        (node.callee.property.name == "lazyRequireGetter" ||
-          node.callee.property.name == "lazyImporter") &&
-        node.arguments.length >= 3 &&
-        node.arguments[2].type == "Literal"
-      ) {
-        checkPath(node, node.arguments[2].value);
+      const path = helpers.getDevToolsRequirePath(node);
+      if (path && RX.test(path)) {
+        context.report(node, `require(${path}) is not allowed`);
       }
     },
   };
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-relative-requires.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-relative-requires.js
new file mode 100644
index 000000000000..19f30559eca7
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-relative-requires.js
@@ -0,0 +1,58 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-relative-requires");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 8 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidError() {
+  let message = "relative paths are not allowed with require()";
+  return [{ message, type: "CallExpression" }];
+}
+
+ruleTester.run("reject-relative-requires", rule, {
+  valid: [
+    'require("devtools/absolute/path")',
+    'require("resource://gre/modules/SomeModule.jsm")',
+    'loader.lazyRequireGetter(this, "path", "devtools/absolute/path", true)',
+    'loader.lazyRequireGetter(this, "Path", "devtools/absolute/path")',
+  ],
+  invalid: [
+    {
+      code: 'require("./relative/path")',
+      errors: invalidError(),
+    },
+    {
+      code: 'require("../parent/folder/path")',
+      errors: invalidError(),
+    },
+    {
+      code: 'loader.lazyRequireGetter(this, "path", "./relative/path", true)',
+      errors: invalidError(),
+    },
+    {
+      code:
+        'loader.lazyRequireGetter(this, "path", "../parent/folder/path", true)',
+      errors: invalidError(),
+    },
+    {
+      code: 'loader.lazyRequireGetter(this, "path", "./relative/path")',
+      errors: invalidError(),
+    },
+    {
+      code: 'loader.lazyRequireGetter(this, "path", "../parent/folder/path")',
+      errors: invalidError(),
+    },
+  ],
+});
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-some-requires.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-some-requires.js
new file mode 100644
index 000000000000..b56dd2cf965e
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/reject-some-requires.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/reject-some-requires");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 8 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function requirePathError(path) {
+  const message = `require(${path}) is not allowed`;
+  return [{ message, type: "CallExpression" }];
+}
+
+const DEVTOOLS_FORBIDDEN_PATH = "^(resource://)?devtools/forbidden";
+
+ruleTester.run("reject-some-requires", rule, {
+  valid: [
+    {
+      code: 'require("devtools/not-forbidden/path")',
+      options: [DEVTOOLS_FORBIDDEN_PATH],
+    },
+    {
+      code: 'require("resource://devtools/not-forbidden/path")',
+      options: [DEVTOOLS_FORBIDDEN_PATH],
+    },
+  ],
+  invalid: [
+    {
+      code: 'require("devtools/forbidden/path")',
+      errors: requirePathError("devtools/forbidden/path"),
+      options: [DEVTOOLS_FORBIDDEN_PATH],
+    },
+    {
+      code: 'require("resource://devtools/forbidden/path")',
+      errors: requirePathError("resource://devtools/forbidden/path"),
+      options: [DEVTOOLS_FORBIDDEN_PATH],
+    },
+  ],
+});