ok so after starting up my launcher it showed a recommendation for something called spellcraft and said it was free and provided a link i clicked the link which opened my web browser to the market place where i clicked on spellcraft and then clicked get this item which then opens another tab with this text in it

The address wasn't understood

Firefox doesn't know how to open this address, because one of the following protocols (minecraft) isn't associated with any program or is not allowed in this context.

    You might need to install other software to open this address.

i do not understand why its saying this as i own minecraft i even tried redownloading the installer and nothing was wrong