JohnRayson/Firefox-Speeddial ? reverse-engineered prompt

Build me a Firefox extension that gives the browser a clean Opera style speed dial home page.

I want a start page that shows a grid of saved site tiles with icons and thumbnails, so I can quickly open my favorite pages when I launch Firefox or open a new tab. It should feel simple and polished, with a nice background, tidy spacing, and easy drag and drop style rearranging if that makes sense for this kind of page.

Make it work as a proper Firefox add on, with the page, styling, and scripts wired together so it loads reliably. If you need to check current Firefox extension docs online, go ahead. Use the included assets and keep the design close to a classic speed dial look, not a modern dashboard. Also make sure it’s easy to add, remove, and update shortcuts without the page feeling cluttered.