Just installed the latest Firefox update.
For want of other idleness, with no expectation of comprehension, I clicked to see the list of changes.
Found:
"ASSERTION: Inserting multiple children without flushing"
I may never go to the loo again!
Creature says that you get some oddities in SAP too.
For example, there is a column which, if you display it, shows either H or S.
This is German for debit or credit - Soll and Haben.

If you think that's funny, Pani, you wait until I tell you about a SAP screen variant after Creature has refreshed his memory about it tomorrow.
And it is Credit Note Enjoy Entry - these Germans may have a sense of humour after all, twisted though it might be.