diff --git a/browser/themes/linux/preferences/in-content/preferences.css b/browser/themes/linux/preferences/in-content/preferences.css
index a166230a9852..3b4e6a9e2b4c 100644
--- a/browser/themes/linux/preferences/in-content/preferences.css
+++ b/browser/themes/linux/preferences/in-content/preferences.css
@@ -13,6 +13,10 @@ button[type="menu"] > .button-box > .button-menu-dropmarker {
   -moz-appearance: none !important;
 }
 
+.help-button > .button-box > .button-icon {
+  -moz-margin-end: 0;
+}
+
 menulist:not([editable="true"]) > .menulist-dropmarker {
   display: -moz-box;
   margin-top: 6px;
diff --git a/browser/themes/osx/preferences/in-content/preferences.css b/browser/themes/osx/preferences/in-content/preferences.css
index 5bebc1018396..faa667b0977b 100644
--- a/browser/themes/osx/preferences/in-content/preferences.css
+++ b/browser/themes/osx/preferences/in-content/preferences.css
@@ -10,6 +10,10 @@ menulist:not([editable="true"]) > .menulist-dropmarker {
   margin-bottom: 1px;
 }
 
+.help-button > .button-box > .button-icon {
+  -moz-margin-start: 0;
+}
+
 checkbox:hover::before,
 checkbox[checked]::before {
   -moz-margin-end: -20px;
diff --git a/browser/themes/shared/incontentprefs/preferences.css b/browser/themes/shared/incontentprefs/preferences.css
index e38a39dd0a7b..3e865ff97978 100644
--- a/browser/themes/shared/incontentprefs/preferences.css
+++ b/browser/themes/shared/incontentprefs/preferences.css
@@ -224,6 +224,10 @@ button[type="menu"] > .button-box > .button-menu-dropmarker {
   }
 }
 
+.help-button > .button-box > .button-text {
+  display: none;
+}
+
 .spinbuttons-button {
   -moz-margin-start: 10px !important;
   -moz-margin-end: 2px !important;