Zen theme not writing source maps I have made a subtheme of zen and started making some changes to it's SASS files.
However now I have some layouts that aren't working as I expected, so I went to the chrome devtools, but that only tells me what CSS file the particular thing is in.

What I want is what SASS file it is in. Now, when I read the config.rb file it says it has some support for FireSass, but that plugin has been removed by the author, so no luck there.

I do have the environment set to :development and the firesass = true, therefore the sass_options :debug_info => true.

So I go to the root in the theme file /sites/all/themes/mytheme and run compass watch, but there are never any source maps.
I think this issue: https://www.drupal.org/node/2295227 addresses your question.

Though haven't tried it myself, but the current dev-version of Zen should contain the 'fix' (i.e., using FireCompass instead of FireSass) to debug SASS-code in an easy way.