diff --git a/skin/classic/treestyletab/Linux-styled.css b/skin/classic/treestyletab/Linux-styled.css
index bd0dd49b..0e5e3cf4 100644
--- a/skin/classic/treestyletab/Linux-styled.css
+++ b/skin/classic/treestyletab/Linux-styled.css
@@ -8,7 +8,6 @@
 .tabbrowser-tabs[treestyletab-tabbar-position="top"][treestyletab-tabs-indented="true"]
   .tabbrowser-tab[visuallyselected="true"] {
 	border-radius: 0 0 0 0;
-	-moz-border-radius: 0 0 0 0;
 	height: 1.5em;
 	margin-bottom: 0;
 	padding-bottom: 0;
diff --git a/skin/classic/treestyletab/WINNT-styled.css b/skin/classic/treestyletab/WINNT-styled.css
index c159009f..49d87d9f 100644
--- a/skin/classic/treestyletab/WINNT-styled.css
+++ b/skin/classic/treestyletab/WINNT-styled.css
@@ -9,7 +9,6 @@
 .tabbrowser-tabs[treestyletab-tabbar-position="top"][treestyletab-tabs-indented="true"]
   .tabbrowser-tab:hover[visuallyselected="true"] {
 	border-radius: 0 0 0 0;
-	-moz-border-radius: 0 0 0 0;
 	border-top-width: 1px;
 	height: auto;
 	margin-bottom: 3px;
diff --git a/skin/classic/treestyletab/base.css b/skin/classic/treestyletab/base.css
index d164eb4f..0240a53c 100644
--- a/skin/classic/treestyletab/base.css
+++ b/skin/classic/treestyletab/base.css
@@ -50,7 +50,6 @@
 	-moz-border-bottom-colors: none !important;
 	-moz-border-left-colors: none !important;
 	border-radius: 0;
-	-moz-border-radius: 0;
 	border-top: 1px solid var(--tst-tab-border) !important;
 	background: var(--tst-tab-surface) !important;
 }
@@ -111,7 +110,6 @@
 	border: 0 none !important;
 	border-bottom: 1px solid var(--tst-tab-border) !important;
 	border-radius: 0 0 3px 3px;
-	-moz-border-radius: 0 0 3px 3px;
 }
 .tabbrowser-tabs[treestyletab-style~="vertigo"][treestyletab-mode="vertical"]
   .tabbrowser-arrowscrollbox .tabs-newtab-button {
diff --git a/skin/classic/treestyletab/group.css b/skin/classic/treestyletab/group.css
index 44762f02..f13d8151 100644
--- a/skin/classic/treestyletab/group.css
+++ b/skin/classic/treestyletab/group.css
@@ -46,7 +46,6 @@
 	image-rendering: -moz-crisp-edges;
 	margin: 0 -0.3em -0.3em 0;
 	transform: rotate(8deg);
-	-moz-transform: rotate(8deg);
 }
 
 .background-image-container {
diff --git a/skin/classic/treestyletab/metal/base.css b/skin/classic/treestyletab/metal/base.css
index d259246f..a76e52e8 100644
--- a/skin/classic/treestyletab/metal/base.css
+++ b/skin/classic/treestyletab/metal/base.css
@@ -286,14 +286,13 @@ tabbrowser[treestyletab-tabbar-position="right"]
 	background: #9a9a9a url("shadow-active-l.png") repeat-y top right !important;
 	margin-left: 6px !important;
 	border-radius: 6px 0 0 6px;
-	-moz-border-radius: 6px 0 0 6px;
 }
 .tabbrowser-tabs[treestyletab-mode="vertical"][treestyletab-tab-inverted="true"]
   .tabbrowser-arrowscrollbox
   .tabs-newtab-button {
 	background: #9a9a9a url("shadow-active-r.png") repeat-y top left !important;
 	margin-right: 6px !important;
-	-moz-border-radius: 0 6px 6px 0;
+	border-radius: 0 6px 6px 0;
 }
 
 .tabbrowser-tabs[treestyletab-tabbar-position="left"]
diff --git a/skin/classic/treestyletab/metal/tab.css b/skin/classic/treestyletab/metal/tab.css
index 90a7953b..03ed5d9a 100644
--- a/skin/classic/treestyletab/metal/tab.css
+++ b/skin/classic/treestyletab/metal/tab.css
@@ -12,7 +12,6 @@
 	-moz-appearance: none !important;
 	border: 2px solid transparent !important;
 	border-radius: 0 !important;
-	-moz-border-radius: 0 !important;
 	color: black !important;
 	height: auto !important;
 	max-height: none !important;
@@ -226,7 +225,6 @@
   .tabbrowser-tab[pinned][visuallyselected="true"]:hover {
 	border: none !important;
 	border-radius: 0 !important;
-	-moz-border-radius: 0 !important;
 	padding: 0 !important;
 }
 .tabbrowser-tabs[treestyletab-mode="vertical"]
@@ -263,7 +261,6 @@
 	line-height: 1 !important;
 	border: 1px solid #666666 !important;
 	border-radius: 4px !important;
-	-moz-border-radius: 4px !important;
 	margin: 1px 0 0 1px !important;
 	padding: 2px 4px 2px 3px !important;
 }
diff --git a/skin/classic/treestyletab/sidebar/sidebar.css b/skin/classic/treestyletab/sidebar/sidebar.css
index 0dbaae59..05b921e3 100644
--- a/skin/classic/treestyletab/sidebar/sidebar.css
+++ b/skin/classic/treestyletab/sidebar/sidebar.css
@@ -112,7 +112,6 @@ tabbrowser[treestyletab-mode="vertical"]
 	-moz-appearance: none !important;
 	border: none;
 	border-radius: 0 !important;
-	-moz-border-radius: 0 !important;
 	border-top: 1px solid transparent !important;
 	box-align: stretch !important;
 	-moz-box-align: stretch !important;
@@ -231,7 +230,6 @@ tabbrowser[treestyletab-mode="vertical"]
   .treestyletab-counter-container {
 	background-color: #91a0c0 !important;
 	border-radius: 8px !important;
-	-moz-border-radius: 8px !important;
 	padding: 0 6px !important;
 }
 .tabbrowser-tabs[treestyletab-mode="vertical"]
@@ -295,7 +293,6 @@ tabbrowser[treestyletab-mode="vertical"]
 	background: #d0def5 !important;
 	border: 2px solid #577bf3 !important; /* not OSX's colour but Firefox's */
 	border-radius: 8px !important;
-	-moz-border-radius: 8px !important;
 	padding: 0 1px 0 8px !important;
 }
 
@@ -339,7 +336,6 @@ tabbrowser[treestyletab-mode="vertical"]
 	background: transparent !important;
 	border: 0 none !important;
 	box-shadow: none !important;
-	-moz-box-shadow: none !important;
 	margin: 0 !important;
 	padding: 0 !important;
 }
diff --git a/skin/classic/treestyletab/square/base.css b/skin/classic/treestyletab/square/base.css
index 489364f1..341baddf 100644
--- a/skin/classic/treestyletab/square/base.css
+++ b/skin/classic/treestyletab/square/base.css
@@ -62,7 +62,6 @@
 	margin: 0 !important;
 	padding: 0 !important;
 	box-shadow: none !important;
-	-moz-box-shadow: none !important;
 }
 
 .tabbrowser-strip[treestyletab-tabbar-position="left"][treestyletab-tabbar-fixed="true"],
@@ -128,7 +127,6 @@
 	border-bottom: 2px solid !important;
 	-moz-border-bottom-colors: var(--tst-tab-border) transparent !important;
 	border-radius: 0 !important;
-	-moz-border-radius: 0 !important;
 	-moz-border-image: none !important;
 	border-image: none !important;
 	box-align: stretch !important;
diff --git a/skin/classic/treestyletab/square/dropshadow.css b/skin/classic/treestyletab/square/dropshadow.css
index 3c6ab5dd..0993f0b7 100644
--- a/skin/classic/treestyletab/square/dropshadow.css
+++ b/skin/classic/treestyletab/square/dropshadow.css
@@ -6,13 +6,11 @@
 .tabbrowser-tabs[treestyletab-mode="vertical"]
   .tabbrowser-tab:not([pinned="true"]) {
 	box-shadow: -0.3em 0.3em 0.2em rgba(0, 0, 0, 0.15);
-	-moz-box-shadow: -0.3em 0.3em 0.2em rgba(0, 0, 0, 0.15);
 }
 
 .tabbrowser-tabs[treestyletab-mode="vertical"][treestyletab-tab-inverted="true"]
   .tabbrowser-tab:not([pinned="true"]) {
 	box-shadow: 0.3em 0.3em 0.2em rgba(0, 0, 0, 0.15);
-	-moz-box-shadow: 0.3em 0.3em 0.2em rgba(0, 0, 0, 0.15);
 }
 
 .tabbrowser-tabs[treestyletab-mode="vertical"]
@@ -24,7 +22,6 @@
   .tabbrowser-arrowscrollbox
   .tabs-newtab-button {
 	box-shadow: 0 0.3em 0.2em rgba(0, 0, 0, 0.15);
-	-moz-box-shadow: 0 0.3em 0.2em rgba(0, 0, 0, 0.15);
 }
 
 
@@ -34,7 +31,6 @@
   .tabbrowser-arrowscrollbox
   .scrollbox-innerbox {
 	box-shadow: inset -0.2em 0.2em 0.3em rgba(0, 0, 0, 0.15) !important;
-	-moz-box-shadow: inset -0.2em 0.2em 0.3em rgba(0, 0, 0, 0.15) !important;
 }
 
 .tabbrowser-tabs[treestyletab-mode="vertical"][treestyletab-tab-inverted="true"]:not([overflow="true"])
@@ -43,7 +39,6 @@
   .tabbrowser-arrowscrollbox
   .scrollbox-innerbox {
 	box-shadow: inset 0.2em 0.2em 0.3em rgba(0, 0, 0, 0.15) !important;
-	-moz-box-shadow: inset 0.2em 0.2em 0.3em rgba(0, 0, 0, 0.15) !important;
 }
 
 
diff --git a/skin/classic/treestyletab/ui-base.css b/skin/classic/treestyletab/ui-base.css
index efbc78d4..d8edc865 100644
--- a/skin/classic/treestyletab/ui-base.css
+++ b/skin/classic/treestyletab/ui-base.css
@@ -403,7 +403,6 @@ tabbrowser[treestyletab-tabbar-position="bottom"]
 	border: 0 none;
 	bottom: 0;
 	box-shadow: none;
-	-moz-box-shadow: none;
 	height: 2em;
 	left: 0;
 	margin-top: -2em;