If the disconnected device is indeed suspicious, to keep your information safe, you should change your { -product-mozilla-account } password in your account settings. You should also change any other passwords you saved in { -brand-firefox } by typing about:logins into the address bar.
若解绑的设备确实可疑，为了确保您的信息安全，应及时到账户设置中更改 { -product-mozilla-account }密码，以及在地址栏输入 about:logins，更改所有保存在 { -brand-firefox } 中的网站密码。