How to "freeze" the state of a tab?

Question

Google Chrome

Hello.
How to freeze the state of the open current tab?
What is it for? I periodically update and update my websites. I change the code directly in the developer panel. I add experimental CSS blocks to them. Is there any way to "freeze" the state of the tab in order to continue a little later?

Of course, you can save HTML + CSS to a document, but often some point is missed and it looks different when replayed. Is there any plugin like Session Buddy for example?