Hey there, great question—tracking up-to-date about:config entries for Thunderbird can be tricky since the old Mozillazine page hasn't been updated in years. Here are a few reliable ways to get the latest options directly from the app or its core resources, no external links needed:

• Check built-in tooltips in about:config
  When you’re in the about:config page, hover your mouse over any preference name. A tooltip will pop up with a concise description, its default value, and sometimes context about what it controls. This is the quickest way to get accurate, current details for individual settings that matter to you.

• Use the about:config search bar
  The search field at the top of the about:config interface lets you filter preferences by keyword. If you’re hunting for settings related to a specific feature—like email sync, privacy controls, or extension behavior—typing relevant terms will pull up all active and available preferences tied to that area. These results are always in sync with your installed Thunderbird version.

• Explore Thunderbird’s open-source codebase
  Since Thunderbird is open-source, all about:config preferences are defined in its source files. You can review these files to access every single available option (including experimental ones that might not appear in the about:config UI by default), along with their default values and detailed technical descriptions. This is the most comprehensive method for getting a full list of entries.

A quick heads-up: some preferences are version-specific or experimental, so the exact list will vary based on your Thunderbird release. Always back up your profile before modifying any about:config settings—incorrect changes can lead to unexpected app behavior.

备注：内容来源于stack exchange，提问作者Geremia