Bug 1765423 - Use Window/WindowText for tooltips in the default Windows theme. r=dao

Differential Revision: https://phabricator.services.mozilla.com/D145323

toolkit/themes/windows/global/tooltip.css

@@ -10,7 +10,7 @@
 @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
 
 tooltip {
-  border: 1px solid InfoText;
+  border: 1px solid;
   padding: 2px 3px;
   max-width: 40em;
   background-color: InfoBackground;
@@ -18,6 +18,15 @@ tooltip {
   font: message-box;
 }
 
+@media (-moz-windows-default-theme) {
+  /* We use Window / WindowText instead on the default theme because the
+     default yellowish styles are somewhat ugly */
+  tooltip {
+    background-color: Window;
+    color: WindowText;
+  }
+}
+
 tooltip:not([position]) {
   margin-top: 21px;
 }