Yaru Dark or Adwaita Dark, No Cursor in Firefox browser for Username or Password
When I set Gnome Tweaks/Appearance to "Yaru Dark" or "Adwaita Dark", I have no blinking cursor available in Firefox for any webpage requiring a "username" and "password" entry. When I set Gnome/Appearance to "Yaru" or "Adwaita (default)", the cursor is BLACK and blinking, but when I set it to a dark scheme, the cursor seems to be "white" in a white box for the Username and Password entry.
In setting Gnome Tweaks to a dark scheme, it should still use a "black" cursor for webpages and not change the cursor to "white" on "white".
I'm not sure I have made this clear, but it is not FireFox changing the cursor color. I can set Gnome Tweaks back to anything but a dark scheme in appearance, and restore the cursor to "black" and blinking in Firefox.
Please fix this. It appears in Ubuntu 18.04, 18.10, and 19.04. I would really like to use a dark scheme for Ubuntu.