diff --git a/src/services/style_setter/style_setter.js b/src/services/style_setter/style_setter.js
index 2a001007d..a8b7e43e5 100644
--- a/src/services/style_setter/style_setter.js
+++ b/src/services/style_setter/style_setter.js
@@ -24,11 +24,6 @@ export const createStyleSheet = (id, priority = 1000) => {
       if (!CSS.supports?.('backdrop-filter', 'blur()')) {
         newRule = newRule.replace(/backdrop-filter:[^;]+;/g, '') // Remove backdrop-filter
       }
-
-      // firefox doesn't like invalid selectors
-      if (!CSS.supports?.('selector(::-webkit-scrollbar)') && newRule.startsWith('::-webkit')) {
-        return
-      }
       this.rules.push(
         newRule
           .replace(/var\(--shadowFilter\)[^;]*;/g, '') // Remove shadowFilter references
@@ -161,8 +156,6 @@ export const applyTheme = (
   const eagerStyles = createStyleSheet(EAGER_STYLE_ID, 10)
   const lazyStyles = createStyleSheet(LAZY_STYLE_ID, 20)
 
-  eagerStyles.clear()
-  lazyStyles.clear()
 
   const { lazyProcessFunc } = generateTheme(
     input,