diff --git a/src/common/actionApi.js b/src/common/actionApi.js
index 69c68b8..0cf8528 100644
--- a/src/common/actionApi.js
+++ b/src/common/actionApi.js
@@ -1,5 +1,5 @@
 // #!if browser_target == 'chromium_mv3'
-export default chrome.action;
+export default typeof chrome !== 'undefined' ? chrome.action : undefined;
 // #!else
-export default chrome.browserAction;
+export default typeof chrome !== 'undefined' ? chrome.browserAction : undefined;
 // #!endif
diff --git a/src/common/litI18nUtils.js b/src/common/litI18nUtils.js
index 1f95baa..df502ab 100644
--- a/src/common/litI18nUtils.js
+++ b/src/common/litI18nUtils.js
@@ -16,7 +16,7 @@
 
   #setUpLitL10n() {
     let pLocale;
-    if (chrome.i18n) {
+    if (typeof chrome !== 'undefined' && chrome.i18n) {
       pLocale = Promise.resolve(chrome.i18n.getUILanguage());
     } else {
       pLocale = this.#MWI18nClient.getUILanguage();