Tools Menu icons black in dark themes - Win10

[RealRaven2000]

This only happens when using dark themes in Windows 10. The icons on the tools menu of QuickFolders are dark - expected behavior would be that they are white.

I did not notice this before as I still run Windows 7 on my main profile and there the OS skins the menus:

[RealRaven2000]

I couldn't reproduce the issue on my other Windows 10 PC - menus are not shown in black background here even with dark Tb themes activated, but I will test again later on my wife's laptop. here is an attempt at a fix:
QuickFolders-mx-5.8.3pre1.zip

essentially I added the following lines to quickfolders-layout.css:

#QuickFolders-ToolbarPopup menuitem image {
  fill: var(--toolbarbutton-icon-fill, currentColor);
  fill-opacity: var(--toolbarbutton-icon-fill-opacity);
}

[RealRaven2000]

These are now fixed in 5.17.1:

There are also similar fixes in the options window, which however may depend on the config setting
svg.context-properties.content.enabled = true

because it uses certain vendor specific CSS attributes that are not by default exposed to "content" by Thunderbird.