There is an issue with the FVD Speeddial extension when using the multicontainer extension on Firefox 74.x. I have the speed dial extension set as my home page. When I click on a dial that does not use the "Default" container, it will open the link in a new tab. The original speed dial tab will still be displayed, but it is a grey colored blank page with no data displayed. Refreshing the grey sped dial tab does nothing. One has to manually close the tab. This will also happen when I manually open a new tab.
I have noticed this behavior on both the Linux (running Manjaro) and Windows versions of Firefox.
Customer support service by UserEcho