diff --git a/package.json b/package.json
index 4e03fe5..0b0f183 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "scripts": {
         "clean": "rm -Rf dist/",
         "bundle": "node_modules/gulp/bin/gulp.js clean && node_modules/gulp/bin/gulp.js && node_modules/web-ext/bin/web-ext -s add-on -a dist build --overwrite-dest",
-        "firefox": "node_modules/cross-env/dist/bin/cross-env.js npm run bundle && node_modules/web-ext/bin/web-ext -s add-on run",
+        "firefox": "node_modules/cross-env/dist/bin/cross-env.js npm run bundle && node_modules/web-ext/bin/web-ext -s add-on run --ignore-files '**/*.js'",
         "lint": "node_modules/eslint/bin/eslint.js .",
         "lint:fix": "node_modules/eslint/bin/eslint.js --fix .",
         "test": "npm run clean; npm run bundle && ln -s `ls dist/` dist/webapi_manager.zip && node_modules/cross-env/dist/bin/cross-env.js node_modules/mocha/bin/mocha test/unit/*.js test/functional/*.js --only-local-tests",