diff --git a/src/contentScripts/index.ts b/src/contentScripts/index.ts
index 89582cc6..84e05ec9 100644
--- a/src/contentScripts/index.ts
+++ b/src/contentScripts/index.ts
@@ -8,7 +8,8 @@ import { SVG_ICONS } from '~/utils/svgIcons'
 import { injectCSS } from '~/utils/main'
 import { settings } from '~/logic'
 import { runWhenIdle } from '~/utils/lazyLoad'
-import { isFirefox } from '~/utils/env'
+
+const isFirefox: boolean = /Firefox/i.test(navigator.userAgent)
 
 // Fix `OverlayScrollbars` not working in Firefox
 if (isFirefox) {
diff --git a/src/utils/env.ts b/src/utils/env.ts
deleted file mode 100644
index 03c23a8b..00000000
--- a/src/utils/env.ts
+++ /dev/null
@@ -1 +0,0 @@
-export const isFirefox: boolean = /Firefox/i.test(navigator.userAgent)