Currently bookmarks inside "simplestart" folder are not shown - change it: when user clicked on "Simple Start" header on navbar - show bookmarks inside root folder.
Option to change bookmarks view to list.
Show bookmarks in table like container - one after another, divided by line.
Show only Favicon (on left) and on right (which use most of the width) show only bookmark title.
After first install of extension most likely there won't be any bookmarks created inside root folder, because of that it would be great to show user some text like "To create your first bookmark click on + at the top of page or save bookmark inside 'simplestart' folder."
As soon as first bookmark is created - don't show this text anymore.
Option to change bookmarks view to compact.
Show bookmarks in small container (kinda like smaller version of cards in thumbnail view) with favicon on left and bookmark title on right (which takes most of this card size).
Using Firefox: "options_ui": { "page": "options.html", "open_in_tab": true }
Make website where user can change a lot more things - like: height of navbar, style of text inside bookmarks cards, style of cards etc.
User can go to this page by clicking 'preferences' button in Firefox Add-ons Manager or by clicking button inside settings-menu.