FireSass is a Firebug extension that makes Firebug display the Sass filenames and line numbers of Sass-generated CSS styles rather than those of the generated CSS.
First, install FireSass from this page. Second, enable Sass's
:debug_info option. If you're using Sass with a Ruby web framework, you probably want to set
Sass::Plugin.options[:debug_info] = true. Add this to
config/environment.rb in Rails, or
(or wherever else configuration is specified) in other Ruby frameworks.
If you're using Sass from the command line, just pass in the
--debug-info flag. Finally, delete all the existing CSS files so that they'll be regenerated.
FireSass requires Sass 3.0 or later.
FireSass should work with all versions of Firefox after and including 3.0, and FireBug versions 1.4 and 1.5. It might work with FireBug 1.6 (which is in development at time of writing), but that's not guaranteed.