[orca-list] How to debug Orca-Firefox communication?

[Elias Oltmanns <eo nebensachen de>]

Hi all,

on a machine running Ubuntu 20.04 LTS, I have serious trouble surfing
certain websites. In order to get to the bottom of this, I have created
a new test user. Since I am mostly working on the console, I logged in
and ran:
startx
Then, I started Orca, completed the initial-setup dialogue and started
Firefox. Navigation on the Welcome page worked pretty much as expected.
Next, I pressed Alt+F2 and entered:
orca --debug -r
Back in Firefox, I entered into the address field:
https://www.amazon.de
This is where the system got very slow and generally behaving rather
odd. Pressing the tab key, for instance, was echoed by Orca but did not
bring me to the next link. Arrow key navigation worked (slowly), so I
was able to answer the cookie dialogue. All the same, the system got
almost unresponsive to the point that I had a hard time quitting Firefox
and the Gnome Session.

The debug log is huge and I am rather lost as to what I should be
looking for. It strikes me, however, that there are lots of messages
like these:
ERROR: Event any_data contains defunct child/descendant
The whole file contains 916472 lines capturing a timespan of roughly ten
minutes. There are roughly 18000 lines containing the keyword ERROR
concentrated in a time span of five minutes.

Do you have any advice how to proceed?

Thanks in advance,

Elias