Sidebar with bookmarks for firefox + port for plugins from version 3 to 4?

Question

Bookmarks

1. I have been looking for a plugin for a long time - a sidebar with bookmarks for ff. The idea is this - there are bookmarks in the form of icons, but since you don’t want to lose space in height, it would be nice to have such a panel on the side. How, for example, you can drag the dock on a Mac.
2. I liked ff4, but a plugin that I use very often has not yet been written for it. Is there a plugin port (I don't know how it's called correctly) that allows you to use plugins from version 3 for 4?

Answer 1

2. addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/

Answer 2

1. Not a plugin, but you can press Ctrl+B.