RET, C-f, Right arrow	Follow hyperlink
d, ESC RET	Save link to file
u	Peek link URL
i	Peek image URL
I	View inline image
ESC I	Save inline image to file
:	Mark URL-like strings as anchors
ESC :	Mark Message-ID-like strings as news anchors
c	Peek current URL
=	Display information about current document
C-h	View history of URL
F	Render frame
M	Browse current document using external browser (use 2M and 3M to invoke second and third browser)
ESC M	Browse link using external browser (use 2ESC M and 3ESC M to invoke second and third browser)