diff --git a/ext/bg/js/translator.js b/ext/bg/js/translator.js
index 1c397780..be1102f9 100644
--- a/ext/bg/js/translator.js
+++ b/ext/bg/js/translator.js
@@ -221,16 +221,6 @@ class Translator {
         }
     }
 
-    static isHiragana(c) {
-        const code = c.charCodeAt(0);
-        return code >= 0x3040 && code < 0x30a0;
-    }
-
-    static isKatakana(c) {
-        const code = c.charCodeAt(0);
-        return code >= 0x30a0 && code < 0x3100;
-    }
-
     static isKanji(c) {
         const code = c.charCodeAt(0);
         return code >= 0x4e00 && code < 0x9fb0 || code >= 0x3400 && code < 0x4dc0;