Cool idea Rated 5 out of 5 stars

I like this, a lot, it's clever.

One thought, it would be nice to have some sort of indicator (arrow, etc) displayed when sections are hidden.
Not a lot, but some pages (like drafts) only have headings and after using this for awhile on many pages, remembering what the user has hidden may be difficult.

Thanks for developing it.

This review is for a previous version of the add-on (0.5.1-signed).