How to stop Firefox from launching everytime I turn on my MacBook?

Hi Everyone,
Everytime I turn on my MacBook, Firefox launches. It really bugs me, and I tried to stop it, but couldn't find how, either in system preferences or in the firefox menus.
Can someone please help and tell me how to stop it from happening?
Thanks already,
Quentin

This usually happens because you've added the application to the Login Items list in the Accounts preferences. Open Accounts preference, click on the Login Items tab, locate the Firefox entry, select it then click on the "-" button to delete it.

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