on my mac ls -la is formatted a little differently, but folder at the same but the extension file as read/write
drwxr-xr-x 4 johns_iMac staff 136 2 Jan 2017 su_bezier
-rw-rw-rw- 1 johns_iMac staff 1784 23 Apr 2013 su_bezier.rb
when I run it on the folder
drwxr-xr-x 4 johns_iMac staff 136 2 Jan 2017 .
drwxr-xr-x 86 johns_iMac staff 2924 14 Jul 03:32 ..
-rw-rw-rw- 1 johns_iMac staff 13866 23 Apr 2013 bezier.rb
-rw-rw-rw- 1 johns_iMac staff 88 30 Apr 2013 extension_info.txt
again read/write…
this is a recent fresh download using Extension Manager…
john