Developer shares hard-won fixes for macOS Markdown Quick Look extension bugs

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A developer building QuickMark, a macOS Quick Look extension for rendering Markdown previews, documented four significant debugging challenges encountered during development. A silent failure caused the extension to stop working after manual code-signing, because re-signing stripped the required sandbox entitlement, prompting the system's plug-in daemon to quietly reject it. A separate priority conflict with another installed Markdown extension caused Quick Look to ignore the new build entirely, resolved only by uninstalling the competing app. The developer also replaced the Shiki syntax highlighter with Prism, cutting cold render time from roughly 200–400 ms to 50–100 ms, a critical improvement given that Quick Look panels must appear nearly instantly to feel useful. These findings are shared as practical case notes rather than definitive rules, with the developer acknowledging informal testing conditions throughout.

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