would like to clear dropdown box @ email site

When I go to sign in to my Yahoo mail account, the dropdown box there always shows a variety of other account choices (guests of mine who have used this computer to check their email while they were visiting, for instance). Is there a way to clear that particular dropdown box? Clearing my browsing, download, search and form histories doesn't do the trick, nor does deleting cookies.

 

Assuming your signature is accurate have you looked at FireFox->Options->Security->Saved Passwords?

 

And, if IE is used for the same purpose, I would check that too.
I, personally, wish I had the problem, as my wife and I have Yahoo accounts. We, always have to login separately.

 

another option is to highlight the account name and hit the delete button.

 

Sometimes the simple answers are just too easy to spot

 

Sorry I didn't acknowledge your replies earlier - for some reason I didn't get email notification about the posts.
In any case, Purple Hippo's solution appears, embarrassingly enough, to have been the answer.
Thank you for resolving something I have been trying for YEARS to do!