Hello,
Even though my addon is compatible with the new Firefox for Android (code name "Fenix), Firefox team decided that they will allow installation only handful of addons (about 9) with a plan to support about 30 by the end of this year.
There is a huge discussion here:
https://discourse.mozilla.org/t/add-on-support-in-new-firefox-for-android/53488/7

They are planning to support all extensions eventually, but there is no estimate when will that happen.

However there is a partial workaround - my Cloud Dials page works in every web browser, including the new Firefox. So just create cloud account if you don't have one already and use the Cloud dials page instead.
Currently it's not editable, I need to upgrade my server which will take some time...
Also make sure to enable thumbnails synchronization on your desktop, then you cloud dials will look exactly the same on your Android.
https://group-speed-dial.fastaddons.com/cloud

Best regards,
Juraj Mäsiar

Zdravím :),
Je to veru blbé s tou ich novou verziou čo podporuje iba 9 doplnkov :(
Ale črtá sa na lepšie časy lebo do konca mesiaca Mozilla vydá "Nightly" verziu nového Firefox for Android kde povolí všetky doplnky, takže verím, že čoskoro sa to dostane aj do normálnej "Release" alebo aspoň "Beta" verzie.

Každopádne je tu ešte jedna náhrada - stačí si urobiť účet na mojom serveri, zapnúť synchronizáciu náhľadov a potom používať na tablete cez Cloud stránku:
https://group-speed-dial.fastaddons.com/cloud
(táto webová verzia síce nie editovateľná z tabletu, ale inak funguje a vyzerá takmer úplne rovnako)

Pozdravujem z Dolného Kubína :)
Juraj

Hello,
Are you sure it's related to my addon? Last version was released a week ago.
If your tabs got closed, it shouldn't be related to this addon at all.
But you should be able to restore your closed tabs with "Ctrl + Shift + T" or "Ctrl + Shift + N" to restore closed windows.
You can also contact me to my support email.
Best regards,
Juraj Mäsiar

Hello,

Thank you for the feedback.
I like the idea with the "default group", I've created issue for it here:
https://github.com/fastaddons/GroupSpeedDial/issues/20

Regarding the merging tabs - what exactly do you mean? Could please write me more details? There is plan to support tree-like structure for groups:
https://github.com/fastaddons/GroupSpeedDial/issues/21

Regarding "group string has no separators" - what do you mean? Please write me to my support email.

Thanks again and have a nice week :)

Best regards,
Juraj Mäsiar

Hello,
The thumbnails are created from previews, so yes, without internet you won't get previews.
But once you get online, you can reload them all from the main menu.
And if you really want to stay offline 100% time, you can load individual thumbnails locally from the drive.
Best regards,
Juraj Mäsiar