Hello,
Sure thing, it's on my todo list for few months now, I will try to give it higher priority.
I'm not very good with estimates since there are way too many features and things to be done, but I'm pretty sure it will be finished this year. After I finish current thumbnails synchronization there will be some groups related features where I could add this as well.

Best regards,
Juraj Mäsiar

Hello,

This seems like issue with your cookies. My add-on is using cookies to keep you logged in.
See the Firefox Options page (about:preferences) and on the tab "Privacy & Security" check the Cookies settings and also History.
If you set it up to Remember history and "Accept cookies and site data from websites (recommended)" with "Keep until - They expire" then it should work.
Also if you are using some tool (or add-on) to block cookies, make sure to add exception for domain "group-speed-dial.fastaddons.com".

Let me know to my support e-mail if this didn't helped.

Best regards,
Juraj Mäsiar