If you have multiple accounts like different Facebook accounts, twitter accounts , mail accounts or any other type of account, you can sign in with the different account on your Firefox browser Simultaneously! This is possible with the help of an extension that allows Firefox to connect to websites using different user names to access an account without interfering each other.

Comparing with the normal method of signing in two different accounts whereby you will have to use a different browser to access your accounts which may be frustrating at times and the worst part is the time wastage but using this simple method in this link, you will find accessing your multiple accounts easy without having to use different browsers.