If you forgot your password and/or username of your email account (Hotmail, Gmail, Yahoo …) or your favorite social network (Facebook, Twitter …), before contacting the site’s support team or help section and filling out forms, you can access the configuration options of your web browser and see if the login credentials of your account are stored there.
How To Recover Gmail, Hotmail, Yahoo, or Facebook Account on Google Chrome
If you use Google Chrome, open the menu in the upper right corner of the browser and select Settings. Then, go to the bottom of the page and click Show advanced settings. In the Passwords and forms section, click Manage passwords:
Under Passwords, all the sites where you’re signed into with Chrome will appear, as well as your username and password behind points. To view the password, select one of the sites and click Show:
What To do if you Forgot Login and/or Password for Gmail, Hotmail, Yahoo, or Facebook on Firefox
If you use Firefox, click the Tools tab and select Options. In the Options window, go to the Security tab and click Saved Passwords: