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Thunderbird is no longer highlighting the tag colors in the list of emails

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I recently upgraded Kubuntu to 19.10 on a brand new HP computer. I installed Thunderbird 168.1.2+build1-0Ubuntu1. On the list of emails when I tag one of the emails, the color of the tag does not show up on the listed email. It does show up when I choose that email. On my HP laptop, with the same version of Kubuntu and Thunderbird, it works as it always has. When I tag an email, it shows up in the list with the color of the tag. I have used Thunderbird on Kubuntu for well over 10 years and I have never seen this problem. Tags are very important to me when use Thunderbird. Any help or suggestions would by appreciated.

Thank You

I recently upgraded Kubuntu to 19.10 on a brand new HP computer. I installed Thunderbird 168.1.2+build1-0Ubuntu1. On the list of emails when I tag one of the emails, the color of the tag does not show up on the listed email. It does show up when I choose that email. On my HP laptop, with the same version of Kubuntu and Thunderbird, it works as it always has. When I tag an email, it shows up in the list with the color of the tag. I have used Thunderbird on Kubuntu for well over 10 years and I have never seen this problem. Tags are very important to me when use Thunderbird. Any help or suggestions would by appreciated. Thank You

Chosen solution

The problem was ReminderFox which wasn't working anyway. Sorry for any trouble.

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I just did some research which indicated the problem may be caused by an extension. I restarted in safe mode and got my colors back. I'll have to track down the extension that is causing the problem. I will work on that as I get a chance. Any suggestions would be appreciated.

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Chosen Solution

The problem was ReminderFox which wasn't working anyway. Sorry for any trouble.

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I disabled ReminderFox and the coloring switched back to normal. Thanks for the assist!

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I have this problem without RenderFox in Thunderbird 68.5.0 from the Fedora 30 repository but I need to upgrade to the next FC at the end of the month, so we will see if the problem persists.