Firefox stores all your passwords in their its internal Password Manager. To import these into 1Password, click the Continue button below and your passwords will be automatically imported.
Once your import all your browser passwords, you do not need to do it again. 1Password will share all your data with every browser that it is installed in and therefore your passwords will always stay in sync.
You can disable the Firefox Password Manager features and rely on 1Password to save all your passwords and fill all your forms.