Firefox 47 creates spam lines

Simply browsing webpages creates this sort of spam, which keeps being added to (the webpages loaded fine):

err:(dll/win32/msafd/misc/dllmain.c:2791) Setting send buf to 90ff880 is not implemented yet
err:(dll/win32/msafd/misc/dllmain.c:1951) Async Connect UNIMPLEMENTED!
WARNING: WSHIoctl at dll/win32/wshtcpip/wshtcpip.c:366 is UNIMPLEMENTED!
(dll/win32/wshtcpip/wshtcpip.c:368) Ioctl: Unknown IOCTL code: -1744830460
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2451) Unknown dwOption 10
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2451) Unknown dwOption 10
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2451) Unknown dwOption 10
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2451) Unknown dwOption 10
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2451) Unknown dwOption 10
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:(dll/win32/wininet/internet.c:2451) Unknown dwOption 10
fixme:(dll/win32/wininet/internet.c:2391) INTERNET_OPTION_PER_CONNECTION_OPTION stub
TCP operation failed: 0xc0000128 (-12)
TCP operation failed: 0xc0000128 (-12)