Excellent addon.

Yay! is easy to use and easy to costomize, too. It replaces my old "start-page", which was just a HTML-File with a table and logo-pictures. Yay! does the same job with less effort.

Also important: *It really works with Android!* It is not just a PC-Version with PC-Handling (like other speed-dials). You can really use it there.

While the addon is fully operational for the PC-Version of Firefox, it misses some of the functions in the Android-Version of Firefox - mostly because the Mozilla developers made totally unnecessary restrictions to access the bookmarks. (I assume to promote Mozilla Sync...)

Not working with Android:
- It needs a work around for easy adding bookmarks.
- Auto-Icon or Screenshot Icon is not working.
These are just minor flaws. Everything else I tested (add and sort bookmarks, theming, You can also export/import settings etc.) works fine.

Not tested: cloud sync for settings.