It seems I picked this up when I built this F28 system in both
/usr/lib64/firefox/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}.xpi
/usr/lib64/thunderbird/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}.xpi
Seems to be an unpleasant Ads thing. I noticed it because how I run
Thunderbird (from a script in a terminal window) shows the messages:
1528602128990 addons.update-checker WARN Update manifest for
{972ce4c6-7e08-4474-a285-3208198ce6fd} did not contain an updates property
1528688529402 addons.update-checker WARN Update manifest for
{972ce4c6-7e08-4474-a285-3208198ce6fd} did not contain an updates property
1528774929718 addons.update-checker WARN Update manifest for
{972ce4c6-7e08-4474-a285-3208198ce6fd} did not contain an updates property
1528861329720 addons.update-checker WARN Update manifest for
{972ce4c6-7e08-4474-a285-3208198ce6fd} did not contain an updates property
The tools I found for removing it are all windows based. How do I get
rid of this? Stop Thunderbird and Firefox and delete the .xpi files?
Thanks