This is an awesome idea! After much using minimaps in e.g. Visual Studio Code, I’m glad that those little “developer-oriented” gadgets are finding their way to other general-purpose software. Vivan los add-ons!
A useful addition for long web pages. It's great that he allows you to navigate (jump) on the web page.
Bugs: 1) Оn the forums: Minimap not always updated when opening/closing the spoilers. 2) On the livejornal: after closing the 'cut', very occasionally the browser some time not responding. 3) When you resize the sidebar, the selection of the location on the web page doesn't react to it immediately.
I would like: 1) Don't update Minimap when hover over the link/cut. Only after clicking. 2) Make a button on the toolbar for quick turn on/off the display Minimap.