image/                         = sxiv-rifle
video/                         = mpv
audio/                         = mplayer::urxvtc
text/html                      = firefox
text/                          = gvim
application/pdf                = zathura
application/x-mobipocket-ebook = ebook-viewer
application/epub*              = ebook-viewer
application/vnd.ms-excel       = libreoffice
inode/directory                = ranger?:urxvtc
model/x.stl-binary             = fstl
@^(https?://|www\.)            = firefox