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How t remove strange artefect which appeared in UI

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I've had Thunderbird instaled on this Windows 10 machine for about 18 months, and it has been running fine.

A couple of days ago, a strange grey bar appeared along the bottom of the Thunderbird window, with red test "toolbarbutton" - see screen shot. I am not sure why this suddenly appeared, there were no unusual events at the time. It just showed up, one day.

Any suggestions how I can remove this extraneous artefact. I tried a lot of add/remove toolbar, change layout, etc, through the View menu, nothing made any difference. I also trawled through prefs.js but didn't see anything obvious.

Very grateful for any assistance.

I've had Thunderbird instaled on this Windows 10 machine for about 18 months, and it has been running fine. A couple of days ago, a strange grey bar appeared along the bottom of the Thunderbird window, with red test "toolbarbutton" - see screen shot. I am not sure why this suddenly appeared, there were no unusual events at the time. It just showed up, one day. Any suggestions how I can remove this extraneous artefact. I tried a lot of add/remove toolbar, change layout, etc, through the View menu, nothing made any difference. I also trawled through prefs.js but didn't see anything obvious. Very grateful for any assistance.
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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0

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Matt
  • Top 10 Contributor
  • Moderator
3276 solutions 22599 answers

have you tried restarting without add-on from the help menu? My guess is it is a poorly behaved add-on that is causing the issue. IF the restart works, then it is time to work out which is the issue.

have you tried restarting without add-on from the help menu? My guess is it is a poorly behaved add-on that is causing the issue. IF the restart works, then it is time to work out which is the issue.
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