Like the simplicty, although would be happy to have more extended functionality:
- Left and right margins settings (crucial for wide screen)
- Lock the page feature (no editiing until manual unlock, also remove any editing buttons)
- Hide page tabs
- Disable or choose other outline for selected blocks
and more.
- Select own icons from hard drive or by web link
Although extension says "The complete anonymity of your data, only you have access to it.", it requires strange permissions: "Access your data for all websites" and "Access browser tabs". Would be great to explain why it is required.

Promising, with interesting features. But I have over 1000 bookmarks and after 10 minutes of icon twirling, I gave up. Will try again if updated.