Excellent. After trying various suggested hacks, I decided to give this new extension a try. It produced a very good PDF, preserving most of the formatting, and, importantly, the entire thread, which had already exceeded the maximum of 68 pages that browser PDF-printers seem to allow per webpage. Well done to the developer. If you can create a universal LLM exporter, I'll give that a try too.

Exactly what Claude.ai is missing

As a heavy Claude user (journalist, dozens of chats per week), I desperately needed a way to archive and organize my conversations. Claude.ai itself offers no folder system and very limited export options. This extension solves everything.
What I love:

Artifact export actually works — you can include them inline in the .md file or get them as separate files in a ZIP
Extended thinking toggle — I can exclude it completely, which makes exported files much cleaner and easier to read
Flexible metadata options — include or exclude as needed
Browse function — finally a way to see all my conversations at a glance, search, filter, and batch export

One minor issue: when a user prompt is very long, Claude.ai displays it as an attached file labeled "PASTED" rather than inline text. These pasted prompts don't appear in the exported .md file. This is a small limitation, likely due to how Claude.ai handles long inputs rather than a flaw in the extension itself.
Overall: agile, flexible, fast. A must-have for anyone who uses Claude regularly and wants to keep organized archives of their work.