[Evervess]

Hello there!

I come with a kind of easy problem, I think.

You see, I want to know if there is a possibility to actually retrieve the log in information of an account that has previously logged in on my PC, by having the browser's data (cookies and such).

If there is, could you please explain me how it's actually done?

Much anticipated thank you! :)

[Xeznok]

If it's a website you need the info for, best bet is probably a keylogger and getting them to login again.

[Mr. Robot]

If the browser hasn't been closed since the password was entered, definitely.
Try
https://hackforums.net/showthread.php?tid=5531642

Otherwise you will need a keylogger or for them to save the password to the browser.