Salesforce 799 Credentials for Chrome
More About Salesforce 799 Credentials
Recommended for : If you are a developer or project manager or an administrator who need to access various salesforce orgs more frequently then this extension will save your time, Because you are just one click away.
This extension supports sandbox, productions and developer orgs. You can delete saved credentials , add new credentials etc.
Why should I go for this because there are already couple of extensions for the same purpose ?
Here you go with the answer, most of developers first copy username paste into username field and then copy password then paste into password field, but most of other extension will clear your username when you went to other tab to copy password. But this will keep remember your username and password and other information also.