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BookmarkViewer 18.104.22.168-signed.1-signed Requires Restart
This shows the formatted bookmarks when you go 'about:bkviewer'. I recommend to set the URL as startup page. You can change the theme. Currently 2 themes are supported. The rounded_box theme can collapse/expand a category box by clicking the title.
About this Add-on
You can read/clone the source at/from https://github.com/alprut/bkviewer.