Your idea of being able to view usernames by searching the password is a very bad idea. Say I search a random password and come across someones account I can totally ruin their account for them.

However it could be helpful if you have a secret questions or find username via email. You shouldn't be creating multiple accounts though

ur password and email are always kept a secret to the public, unless u urself put it on ur sig or in the post content. Hence it's not a good idea and will be a violation to the terms of service for us to provide a way to search for username through email or password.

there are several things I can recommend:

note down the account username and email, as well as password on a note, and store it somewhere safe

archive the registration email that u got after registering ur account, it usually has the username on it

or, simply don't use multiple accounts, stick to one and use it.

what i want to know is why did you put a colon on every voting option?

According to the ToS you agreed to you should only have one account.

as I said, we can't provide a way to search for a username from password, or email. Even if it's "on ur own computer" only.

Browser stores ur data on something called cookies, this is the one responsible for ur login session. And cookies have an expiration date. Which means ur stored data is only stored temporary. Thus we can't really rely on this method.

things like auto-complete are browser-specific and we can't really do anything about that, except tell the browser not to auto-complete which I don't think is wat u want.