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autor: Nawoj wystawiona: Sie. 7, 2026 ·

Hello,

I am a big fan of the Thunderbird Conversations add-on, but I've encountered a recurring rendering issue with complex marketing emails.

The Problem:
Simple HTML emails (e.g., standard multipart/related emails using basic inline-styled tables) render perfectly fine in the conversation view. However, complex multipart/alternative marketing emails generated by platforms like HubSpot often render completely blank or invisible.

Technical Details & Root Cause:
After inspecting the raw source of the failing emails, the issue seems to stem from how the add-on's HTML sanitizer/parser handles specific hidden preheader elements and deep div nesting.

Aggressive Preheader Hiding: The failing emails typically start with a hidden preview text block right after the <body> tag, formatted like this:
<div id="preview_text" style="display:none;font-size:1px;color:#ffffff;line-height:1px;max-height:0px;max-width:0px;opacity:0;overflow:hidden;" lang="en">...</div>

Deep Nesting (hs_cos_wrapper): The main content is deeply nested within multiple wrapper divs.

It appears that during the extraction and cleaning of the HTML body, the Conversations add-on either chokes on the heavy nesting or, more likely, the aggressive hiding styles (display: none, max-height: 0px, opacity: 0) from the preheader bleed into the parent container or sibling elements. This causes the main content body to inherit a zero-height or hidden state, making the email appear blank in the conversation thread.

Suggested Fix:
Could you please review the HTML sanitization logic? Specifically:

Ensure that inline CSS intended to strictly hide preview text (like display: none or max-height: 0) does not cascade or get mistakenly applied to the main wrapper/DOM tree during rendering.

Verify that the parser doesn't break or drop the DOM structure when encountering heavy wrapper nesting (e.g., <div class="hs_cos_wrapper"> layers) after stripping external <style> blocks.

Thank you for your hard work on this amazing add-on! Let me know if you need full raw .eml samples for debugging.

Ten użytkownik wystawił dla tego dodatku także inną opinię.

przez Standard8 (Autor) dnia Sie. 7, 2026 ·

Please file an issue at the support site rather than here, this is not a bug tracker.

Thunderbird does all the sanitisation, Conversations doesn't control that.