Can’t edit Accordion Pane in Firefox with mouse

WP 5.0.3 + Kadence 1.3.0

Tabs works in Firefox, Tabs and Accordion works in Google Chrome.
But when opening a new Accordion Block in Firefox, only the first Pane (because it’s preselected) is editable. Mouse-click in second/other Pane – or first Pane after clicking elsewhere – does not work (Pane not editable with mouse).
The content parts below the panes are always editable without any problem.

Have found a workaround with Gutenberg Block-Navigator which brings the cursor into the selected Pane and make it editable if only using keyboard. But no mouse-clicks in Panes are possible in Firefox.