I want to sync bookmarks and history from my old computer to my new computer. The problem is that my computers are logged into my two different firefox accounts. The reason is this:

I wanted to sync bookmarks and history from my old computer to my new computer. On my new computer I was already logged in on a firefox account I cannot remember I have made and therefore I cannot remember the password. So when I wanted to log in to the same account (my old firefox account) on my old computer I could not because I could not remember the password. Then I created a new firefox account so I could log on the new firefox account on both my old and new computer and then make them sync. I created the new firefox account on my old computer and wanted to log into the new firefox account on my new computer (which was signed into my old firefox account). The problem is that I do not know how to log out of my old firefox account on my new computer in order to log into my new firefox account on my new computer and sync with the old computer. Neither can i delete my old firefox account because I do not know or remember my password. All I want to do is to log in to my new firefox account on my new computer so I can sync it with my old computer which is already logged in to my new firefox account. I hope you can help me. Thanks