--- a/mail/themes/linux/mail/preferences/aboutPreferences.css
+++ b/mail/themes/linux/mail/preferences/aboutPreferences.css
@@ -5,28 +5,24 @@
 @import url("chrome://messenger/skin/shared/in-content/aboutPreferences.css");
 
 html *,
 page *,
 window * {
   font-size: 1.11rem;
 }
 
-caption > label:not(.dialogTitle) {
+caption label:not(.dialogTitle) {
   font-size: 1.27rem;
 }
 
 checkbox {
   -moz-binding: url("chrome://global/content/bindings/checkbox.xml#checkbox") !important;
 }
 
-radio {
-  -moz-binding: url("chrome://global/content/bindings/radio.xml#radio") !important;
-}
-
 spinbuttons {
   -moz-appearance: none;
 }
 
 .treecol-sortdirection {
   /* override the Linux only toolkit rule */
   -moz-appearance: none;
 }

--- a/mail/themes/linux/mail/preferences/dialog.css
+++ b/mail/themes/linux/mail/preferences/dialog.css
@@ -4,11 +4,11 @@
 
 @import url("chrome://messenger/skin/shared/in-content/dialog.css");
 
 label,
 textbox,
 description,
 .tab-text,
 .tree-rows,
-caption > label {
+caption label {
   font-size: 1.11rem;
 }

--- a/mail/themes/osx/mail/preferences/aboutPreferences.css
+++ b/mail/themes/osx/mail/preferences/aboutPreferences.css
@@ -5,17 +5,17 @@
 @import url("chrome://messenger/skin/shared/in-content/aboutPreferences.css");
 
 html *,
 page *,
 window * {
   font-size: 1.36rem;
 }
 
-caption > label:not(.dialogTitle) {
+caption label:not(.dialogTitle) {
   font-size: 1.55rem;
 }
 
 prefpane .groupbox-title {
   background: none;
   margin-bottom: 0;
 }
 

--- a/mail/themes/osx/mail/preferences/dialog.css
+++ b/mail/themes/osx/mail/preferences/dialog.css
@@ -9,17 +9,17 @@ prefwindow,
   font: message-box !important;
 }
 
 label,
 textbox,
 description,
 .tab-text,
 .tree-rows,
-caption > label {
+caption label {
   font-size: 1.36rem;
 }
 
 caption {
   font: message-box;
 }
 
 .prefWindow-dlgbuttons {

--- a/mail/themes/shared/mail/incontentprefs/aboutPreferences.css
+++ b/mail/themes/shared/mail/incontentprefs/aboutPreferences.css
@@ -20,17 +20,17 @@
   position: relative;
 }
 
 #prefBox > windowdragbox {
   background-color: #ebebef;
   width: 240px;
 }
 
-caption > label {
+caption label {
   font-size: 1.3rem;
   font-weight: 600;
   line-height: 22px;
   margin: 0 !important;
 }
 
 #preferencesContainer {
   padding: 40px 28px;

--- a/mail/themes/windows/mail/preferences/aboutPreferences.css
+++ b/mail/themes/windows/mail/preferences/aboutPreferences.css
@@ -5,30 +5,20 @@
 @import url("chrome://messenger/skin/shared/in-content/aboutPreferences.css");
 
 html *,
 page *,
 window * {
   font-size: 1.25rem;
 }
 
-caption > label:not(.dialogTitle) {
+caption label:not(.dialogTitle) {
   font-size: 1.42rem;
 }
 
-@media not all and (-moz-windows-default-theme) {
-  .paneButtonIcon {
-    fill: ThreeDHighlight;
-  }
-}
-
-radio {
-  -moz-binding: url("chrome://global/content/bindings/radio.xml#radio") !important;
-}
-
 .actionsMenu > .menulist-label-box > .menulist-icon {
   margin-inline-end: 9px;
 }
 
 textbox + button,
 filefield + button {
   margin-inline-start: -4px;
 }

--- a/mail/themes/windows/mail/preferences/dialog.css
+++ b/mail/themes/windows/mail/preferences/dialog.css
@@ -4,11 +4,11 @@
 
 @import url("chrome://messenger/skin/shared/in-content/dialog.css");
 
 label,
 textbox,
 description,
 .tab-text,
 .tree-rows,
-caption > label {
+caption label {
   font-size: 1.25rem;
 }