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How do I log off an account?

Sorry for the confusion let me clarify.

1) I use Account "A" for my Chrome browser that I use for personal needs.

2) I use account "B" for my Firefox browser that I use for work.

Accidentially I signed to account "A" on Firefox and downloaded all my business tabs and links. Now I want to log out of account "A" on Firefox and log in to account "B". Both accounts are necessary and each is used for it's special case.

No. I use them in different browsers

No I want to keep using different accounts. But I accidentially logged in into other account, and don't see a setting to switch back