Signed-in site (i.e. Yahoo!) new browser opens in same site...

[Walt]

I find when i am signed in to my Yahoo! home page for instance, that if i
open a new browser it automatically opens the new browser with my Yahoo! home
page. This is disturbing as i should have to log in to my home page and not
have a new browser automatically open in it.

This problem seems to happen only for pages where i have to sign in. It has
happened on my banking web-site too... I was signed in to my online banking,
opened another browser and it opened to my open account page the same as my
other browser.

If i just go to a regular page where i don't have to sign in to anything, a
new web browser does open to my default home page, but "sign-in" pages seem
to create a problem.

I suspect that this is not actually a browser problem as it seems to happen
as well with Firefox... i don't know what else to try though or where else
to go.

Any ideas out there? (i don't enable any automatic sign ins or saving of
passwords etc.)