HELP! How do i make it so that my web browser cookie is permanent? Very important..

[VideoNewbie]

there is a site that i frequent and the password was changed on me but strangely i can still access the site...i am attributing that to the fact that i have the cookie store don my firefox browser (when i try to login with my safari browser with the same password it does not work anymore)

is there any way i can ensure that i do not get logged out?
how do i make the cookie permanent? i know that it sometimes "Resets" itself on its own how do i preven tthat?

 

[JamesMB]

This might work, but I haven't tried it.
https://addons.mozilla.org/en-US/firefox/addon/cookieculler/

This will also work using Firefox prefs, but it's a pain in the arse, because you have to enter them manually. Tools> Options> Privacy> Cookies> click Exceptions button beside the Allow sites to set cookies check mark (make sure the 2 checkboxes beneath that are un-checked). Enter the address for the website or sites you want and click the Allow button. Then click Close> Okay and then exit out of Firefox.