FimFiction Reader
Opens fimfiction.net as app window.
NOTE: i write this app for me to read pony on chromebook, so some things may look weird, but you just have to deal with it
Available at Chrome Web Store for free.
There is now simple alternative: https://github.com/natrim/fimficr (no chrome, no settings, ...) (it was just simple test before writing this chrome app)