Download from Releases and drag that into your mod folder.

or

Setup and compile it yourself(if you dont trust the release).

• Login into an account with a Session ID
• Restore your original Session
• Shows if the Session ID is valid(THIS DOES NOT WORK IF YOU HAVE PIZZA CLIENT SESSION PROTECTION ENABLED) and if the account is currently online on Hypixel
• Error handling for invalid inputs
• Allows you to change the username of the account you are logged in with (Also prevents you from accidentally changing the name of your main account)
• Allows you to change the skin of the account you are logged in with using an url (e.g. http://assets.mojang.com/SkinTemplates/steve.png to change it to a steve skin)
• Simple to use

This is for educational purposes only. I am not responsible for any damage caused by this tool.