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

Hello,
Could you please contact me to my support e-mail?
Also send me please the error message. There is a link to send me e-mail in that error message.

Best regards,
Juraj Mäsiar

Hello,

If you are running 10.6 or 10.7 version AND your Firefox version is below 60, for example 56, then you need to reinstall my add-on (make sure to backup your dials first). Sadly the new version released today is no longer compatible with unsupported versions of Firefox and you need at least Firefox 60 ESR.

So you have two options now:
1) upgrade your Firefox to at least Firefox ESR 60 or current release 62.
2) install older version of my add-on 10.5 from this page: https://addons.mozilla.org/en-US/firefox/addon/groupspeeddial/versions/
(but you will need to uninstall current version first - also make sure to create backup of your dials before you uninstall it!).

However since your Firefox 56 is no longer supported by Mozilla - I'm strongly recommending you to upgrade your Firefox. Your version 56 doesn't contain any security updates released in version 57 and above.

Also if you have more issues, please contact me to my support e-mail.

Best regards,
Juraj Mäsiar

Hello,

Just don't panic. There is a good chance you can still get to them.
Please contact me to my support e-mail. I can assist you with the fix. Don't forget to mention your add-on version, Firefox version and operating system you are using.

Best regards,
Juraj Mäsiar

Hello,

I tried this recently, but It I was not satisfied with the result - I was not able to hide scrollbar properly.
However thanks to recent updates, you can now try it yourself.
Go to Options page, and to the field "Custom CSS styles:" enter this:

.dials > a > div {
overflow-y: scroll;
margin-right: -29px;
}

That will enable scrolling of the dials, plus hides the scrollbar.
Alternatively, if you want to see scrollbar and only when it's really needed (when the image is long enough), you can use this:

.dials > a > div {
overflow-y: auto;
}

I hope this helps :)

Best regards,
Juraj Mäsiar