Firefox: odd behaviour

Hi.
First of all: Nice plugin, thanks!

I have encountered an odd behaviour in Firefox (67.0.2 (64-Bit) under Win 10 Home):
– I am logged into the WordPress Dashboard.
– In page A I set up an accordion with an accordion pane with HTML-anchor.
– I link to there from page B.
– Clicking that link opens page A at the defined accordion pane which opens. Perfect!
– Any next try with this setup opens page A with a locked accordion. Can’t open any pane nor the anchored one opens
– This doesn’t happen when I use another browser for viewing (e.g. MS Edge) or clear all data and restart Firefox (or use a firefox private window)

Have no idea what this is, but is is kind of cumbersome …

Regards