Hello,

I've just released new version 9.8 that contains many changes to auto-reload that could fix these issues.
Since Firefox 61, the special config is no longer needed and the tab will be hidden automatically (it will be in the list of hidden tabs).

Regarding that tab - it's used to create thumbnails if you setup Auto-reload and it's used for background reload (which will be soon the default thumbnail generation method). That tab is being opened and closed depending on your setup - by default it will reload up-to 4 dials at a time and then it gets closed. You can alter this behavior in Options page - you can check the "Keep reloading tab opened after reloading" or change "Maximum concurrently loading pages" to much more than 4 if you have many dials scheduled to be reloaded.

Anyway if you have still issues with current 9.8 version, please let me know to my support e-mail!
Thank you for reporting bugs!

Best regards,
Juraj Mäsiar