diff --git a/content.js b/content.js
index 3dbc1de..2de6754 100644
--- a/content.js
+++ b/content.js
@@ -382,10 +382,6 @@ function showCaptchaToast(reason) {
 const MAX_LOGIN_ATTEMPTS = 3;
 const ATTEMPT_COOLDOWN = 5 * 60 * 1000;
 
-// 失败计数按 envId+domain 索引，同 domain 在不同环境独立计数
-function attemptKey(envId, domain) {
-  return `${envId}::${domain}`;
-}
 
 async function getDomainAttempts(envId, domain) {
   const resp = await chrome.runtime.sendMessage({ action: "getDomainAttempts", envId, domain }).catch(() => null);