I'll always keep this tutorial working. Never worry about :)

Hello! This is to help you with getting your credentials to login and use the Idle Master (2023 version)

So I was trying to login in Idle Master but just using the previous methods wasn't working anymore. At least on Opera GX which is my current browser. And since I couldn't find as the usual I'm just leaving this here to help you all.

Please check this image to guide you
https://i.imgur.com/r3ne3Rz.png

1. To make sure you get the sessionid and steamLoginSecure you need to have your profile open in your browser

2. Press F12 (If F12 doesn't work just click with the right mouse button and go in Inspect Element or CTRL + SHIFT + C)

3. Go to the tab Application

4. In the left side tabs look for the folder Cookies. Right in the first option you will see a link like http://psteamcommunity.yuanyoumao.com... click on it.

5. Here's how you gonna get the info to login. Right there you'll see steamLoginSecure and on the right side in the Value (which will be your password). Copy and paste this on Idle Master. PLEASE DON'T EVER SHARE YOUR COOKIES AND LOGIN INFO. BE VERY CAREFUL WITH THEM.

PS: If don't work at first log off your account in the browser and log in again so it refreshes the expiration date.

This works with OperaGX and FireFox. Maybe will work with whatever browser you use. You just have to find the cookie folder or inspect element and look for the right tabs.

Can't login or error message about wrong credentials? Try to use other page of Steam, your profile or activity (the credentials numbers change from page to page), this should do.

Any other help please go in this link
https://github.com/JonasNilson/idle_master_extended/wiki/Login-methods

Hope I have helped anyone :)