diff --git a/.jpmignore b/.jpmignore
new file mode 100644
index 0000000..1795cff
--- /dev/null
+++ b/.jpmignore
@@ -0,0 +1,13 @@
+.git/
+docs/
+test/
+node_modules/
+
+.env
+.eslintrc.js
+.gitignore
+.htmllintrc
+.jpmignore
+.stylelintrc
+.travis.yml
+testpilot-containers.xpi
diff --git a/package.json b/package.json
index da44e29..34a49f8 100644
--- a/package.json
+++ b/package.json
@@ -33,6 +33,7 @@
     "url": "git+https://github.com/mozilla/testpilot-containers.git"
   },
   "scripts": {
+    "build": "jpm xpi",
     "lint": "npm-run-all lint:*",
     "lint:addon": "addons-linter webextension --self-hosted",
     "lint:css": "stylelint webextension/css/*.css",
diff --git a/webextension/background.js b/webextension/background.js
index 9b707c8..805dd0e 100644
--- a/webextension/background.js
+++ b/webextension/background.js
@@ -13,6 +13,6 @@ browser.tabs.query({}).then(tabs => {
 }).catch(() => {});
 
 function disableAddon(tabId) {
- browser.browserAction.disable(tabId);
- browser.browserAction.setTitle({ tabId, title: "Containers disabled in Private Browsing Mode" });
+  browser.browserAction.disable(tabId);
+  browser.browserAction.setTitle({ tabId, title: "Containers disabled in Private Browsing Mode" });
 }