Put this configuration file in your project folder which will be watched by Fire.app, or simply add the first 3 lines of this gist to your existing config.rb file.

config.rb

require './tilt_jade.rb'

puts Tilt.mappings.inspect
# Require any additional compass plugins here.

# Set this to the root of your project when deployed:
http_path = "/"
css_dir = "public/css"
sass_dir = "sass"
images_dir = "public/img"
javascripts_dir = "public/js"

# You can select your preferred output style here (can be overridden via the command line):
# output_style = :expanded or :nested or :compact or :compressed

# To enable relative paths to assets via compass helper functions. Uncomment:
# relative_assets = true

# To disable debugging comments that display the original location of your selectors. Uncomment:
# line_comments = false

# If you prefer the indented syntax, you might want to regenerate this
# project again passing --syntax sass, or you can uncomment this:
# preferred_syntax = :sass
# and then run:
# sass-convert -R --from scss --to sass sass scss && rm -rf sass && mv scss sass
preferred_syntax = :sass

line_comments = false # by Fire.app 
sass_options = {:debug_info=>false} # by Fire.app 
output_style = :expanded # by Compass.app