Have seed phase. Can't restore

On Mac OS I added MM firefox extension using MetaMask ā€“ Get this Extension for šŸ¦Š Firefox (en-GB) as my existing Metamask was showing a blank screen when I tried to view it.
I selected to install new copy using existing seed phrase. I entered the seed phrase which was successtully accepted. In metamask it shows a new account 1, not my existing account. Iā€™m confused ! how do I restore my orginal account ?

Welcome to the MetaMask Community @RichareC!! :fox_face: :rocket:

You can find the answer to your question in this Knowledge Base support article.