All unread messages marked as read
In the last two days all of my messages have been immediately marked as read (i.e., unread messages do not show up in bold). In options I have chosen 'Automatically mark… (Lesen Sie mehr)
In the last two days all of my messages have been immediately marked as read (i.e., unread messages do not show up in bold). In options I have chosen 'Automatically mark messages as read after displaying for 10 seconds', and in the past this has meant the incoming message showed as bold until I opened and read it, and that the main display indicated how many unread messages I had. I am using Firefox 78.13.0 in Windows 10, but this did not happen after an update: it simply happened overnight. Just now I sent a message from my Gmail account to my Firefox address and have not opened it in Firefox: on my iPad it shows as unread, but on my PC it shows as read, even though I haven't touched it. This problem applies to all three mailboxes in the Firefox account: when I look at the main Firefox display, there is no bold to indicate that any of the mailboxes have new messages.
This is very annoying in terms of business--I can't immediately see whose messages I have not yet read, and whether any new messages have arrived in a particular mailbox since I last opened Firefox (it is too distracting to keep it open all the time). Many thanks for any help.