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No, we almost only use custom made addons and we do not do anything with CSS minification.

However, I can send you the non minimized CSS output and the minimized output, if that helps you. Firefox does not see a big part of the minimized output and works fine with the non-minimized file. All other browsers we tested had no issues. But Firefox is known as very picky with CSS code.

Where can I send you the files? I do not want to attach it here for privacy reasons.