diff --git a/.eslintrc.js b/.eslintrc.js
index 618576a..6893651 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -16,7 +16,7 @@ module.exports = {
   ],
   overrides: [
     {
-      files: "src/**",
+      files: "webExtensionApis/**",
       env: {
         browser: true,
         webextensions: true,
@@ -40,14 +40,22 @@ module.exports = {
     "comma-dangle": ["error", "always-multiline"],
     eqeqeq: "error",
     indent: ["warn", 2, { SwitchCase: 1 }],
+    "max-len": [
+      "warn",
+      {
+        code: 80,
+        ignoreComments: true,
+        ignoreTrailingComments: true,
+        ignoreUrls: true,
+      },
+    ],
     "no-console": "warn",
-    "no-var": "error",
     "no-shadow": "error",
     "no-unused-vars": "error",
+    "no-var": "error",
     "prefer-const": "warn",
     "prefer-spread": "error",
     semi: ["error", "always"],
     "valid-jsdoc": "warn",
-    "max-len": ["warn", 80],
   },
 };
diff --git a/package.json b/package.json
index f77aa61..2d9ab78 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
   "scripts": {
     "build": "cd webExtensionApis/study && webpack",
     "docformat": "doctoc --title '**Contents**' docs/*.md && prettier '**/*.md' --write",
-    "eslint": "eslint src --ext jsm --ext js --ext json",
+    "eslint": "eslint webExtensionApis --ext jsm --ext js --ext json",
     "eslint-fix": "npm run eslint -- --fix",
     "format": "prettier '**/*.{css,js,jsm,json,md}' --trailing-comma=all --ignore-path=.eslintignore --write",
     "lint": "npm-run-all lint:*",
diff --git a/webExtensionApis/prefs/api.js b/webExtensionApis/prefs/api.js
index aef5915..c9d5791 100644
--- a/webExtensionApis/prefs/api.js
+++ b/webExtensionApis/prefs/api.js
@@ -1,7 +1,10 @@
 "use strict";
 
+/* global ExtensionAPI:false */
+
 ChromeUtils.import("resource://gre/modules/Services.jsm");
 
+/*
 const PREFERENCES_PREFIX = "";
 
 function get(key, type = "char") {
@@ -32,6 +35,7 @@ function set(key, type, value) {
   }
   throw new Error(`Unknown type: ${type}`);
 }
+*/
 
 /* https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/functions.html */
 this.prefs = class extends ExtensionAPI {
diff --git a/webExtensionApis/study/src/jsonschema.js b/webExtensionApis/study/src/jsonschema.js
index 45b44a9..95d60ba 100644
--- a/webExtensionApis/study/src/jsonschema.js
+++ b/webExtensionApis/study/src/jsonschema.js
@@ -1,3 +1,5 @@
+/* eslint-env commonjs */
+
 const Ajv = require("ajv/dist/ajv.min.js");
 const ajv = new Ajv();
 
diff --git a/webExtensionApis/study/src/studyUtilsBootstrap.js b/webExtensionApis/study/src/studyUtilsBootstrap.js
index ff419f6..db23fe4 100644
--- a/webExtensionApis/study/src/studyUtilsBootstrap.js
+++ b/webExtensionApis/study/src/studyUtilsBootstrap.js
@@ -72,7 +72,7 @@ this.Bootstrap = function(studySetup, studyUtils) {
       studySetup.addon = { id, version };
       studyUtils.setup(studySetup);
       // TODO bdanforth: patch studyUtils to setLoggingLevel as part of setup method
-      //studyUtils.setLoggingLevel(...);
+      // studyUtils.setLoggingLevel(...);
     },
 
     // choose the variation for this particular user, then set it.