Nope this is not a long shot at all...
First, use calibre, once installed, add the "plugin Update" icon into the main toolbar

Once that done click on it, choose, not installed, and search for the one called FanFictionDownloader - Install it, restart
Install the "icon" from the downloader into the main or second toolbar...
The plugin give you the possibility to grab the URL from several fictions on a same page... you copy and paste, download and read...

Sam