User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/116.0

Steps to reproduce:

got to a normal page that has a favicon set, e.g. www.nu.nl
in the same tab, go to a page that has no favicon set, e.g. a local html file with an empty "head" section

Actual results:

favicon on browser tab is correctly set in both cases
favicon on windows taskbar preview is NOT set correctly in second case, it still shows the favicon from the first page

Expected results:

the preview should not show a favicon when the page does not have one

Hello, thank you for the bug report!
Unfortunately I could not reproduce your issue. Would you be so kind as to answer a few questions so we can investigate this further?

• Does this issue happen with a new profile? Here is a link on how to create one: https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles
• Does this issue happen with latest nightly? Here is a link from where you can download it: https://www.mozilla.org/en-US/firefox/channel/desktop/
• Does this issue happen when Firefox is in Troubleshoot Mode? Here’s a link on how to enable it: https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-troubleshoot-mode
• Could you please attach your about:support info?

Moving the Component to ‘Toolbars and Customization’. Please change if there’s a better fit, thank you.

I forgot to mention that option "show tab previews in the Windows taskbar" must be on
with this option "off", always the small firefox icon is used, and there is no problem.

• Does this issue happen with a new profile?
  yes

• Does this issue happen with latest nightly?
  yes

• Does this issue happen when Firefox is in Troubleshoot Mode?
  yes

• Could you please attach your about:support info?
  yes, attached.