How do i save PDFs directly from web browser to iBooks - on a MAC

Is it possible to save PDFs directly from a web browser (any web browser) to iBooks?

it is easy to view and 'open in' iBooks from an iPad/iPhone, but don't see this option on the MAC.

i have resorted to saving the file and emailing it. Once viewed on the 'i-device' it can be easily saved.

iBooks is installed on my MAC and synced, so i can view the library.

I am just missing this direct step - MAC to iBooks

Please help,

Thanks - Rob