Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More
Open

Calendar event description is hardly visible - black font on dark grey background. Default Theme issue

Den G

After 158.0.1 update the colors are broken when I open a calendar event (in a popup or tab) in edit mode the description has dark background with black font which is very hard to read. I have Dark Mode in windows and this issue is in both Auto and Dark themes in Thunderbird. No matter what theme I install apart from Light the description in unreadable.

After 158.0.1 update the colors are broken when I open a calendar event (in a popup or tab) in edit mode the description has dark background with black font which is very hard to read. I have Dark Mode in windows and this issue is in both Auto and Dark themes in Thunderbird. No matter what theme I install apart from Light the description in unreadable.
Attached screenshots

All Replies (1)

This is caused by the bug https://bugzilla.mozilla.org/show_bug.cgi?id=2077553 Until this bug will be fixed in a future update you can use a temporary workaround via a CSS code in a userChrome.css file which is described in this discussion https://support.mozilla.org/en-US/questions/1609243

Ask a question

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.