Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

mozilla just updated and now when I move my mouse over the email subject line it disappears until I move the mouse

  • 3 replies
  • 1 has this problem
  • 4 views
  • Last reply by schadel

more options

mozilla just updated and now when I move my mouse over the email subject line, the line disappears until I move my mouse off the line.

mozilla just updated and now when I move my mouse over the email subject line, the line disappears until I move my mouse off the line.

All Replies (3)

more options

This seems to appear in W7 systems with certain desktop themes.

https://support.mozilla.org/en-US/questions/1312243

more options

Yes, it occurred on both of my W7 x64 systems with classic theme after the upgrade from 78.4.0 to 78.4.1. Unread messages (listed in bold) disappear when the cursor is hovered over them. Read messages do not disappear.

This anomaly does not occur on my W10 x32 machine (a Dell tablet). Also, in W10, when I hover over an item, either read or unread, the background of that line changes color. It doesn't do that on the W7 machines.

more options

Here's a workaround: Go to Add-Ons and select one of the 2 optional themes. That solves the disappearing problem. The Light theme is very close to the default one. A minor annoyance remains: If 2 or more messages are selected, the background of the menu bar between the selection pane and the preview pane turns dark blue while the clickable items there remain black, making them very hard to read.