Great initiative and thank you for the time you took to transcribe the list of supported sites, however ...
Originally Posted by crich70
I found a webpage that had a list of sites that are supported by the FanFiction Downloader in Calibre and saved the links to a file.
... the link to the Supported Sites list
is on the FFDL Project Home Page
pointed to by the first post of the FFDL Plugin thread
FYI the first post of every plugin
thread frequently has a great deal of information about the plugin.