diff --git a/content/treestyletab/treestyletab.css b/content/treestyletab/treestyletab.css
index b9583ea1..7413cbdf 100644
--- a/content/treestyletab/treestyletab.css
+++ b/content/treestyletab/treestyletab.css
@@ -286,7 +286,7 @@ tabs.tabbrowser-tabs[treestyletab-tabbar-position="left"][treestyletab-invert-sc
 	min-height: 1px !important;
 	opacity: 0 !important;
 	/**
-	 * Sometimes "transitionend" event for "max-width" doesn't fire so ghotst
+	 * Sometimes "transitionend" event for "max-width" doesn't fire so ghost
 	 * tabs are left. To do cleanup process forcedly, we have to re-define new
 	 * max-width to fire transitionend event.
 	 */
diff --git a/skin/classic/treestyletab/metal/base.css b/skin/classic/treestyletab/metal/base.css
index a76e52e8..b4d13c82 100644
--- a/skin/classic/treestyletab/metal/base.css
+++ b/skin/classic/treestyletab/metal/base.css
@@ -9,7 +9,6 @@
 	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/ui-base.css b/skin/classic/treestyletab/ui-base.css
index d8edc865..ad87d301 100644
--- a/skin/classic/treestyletab/ui-base.css
+++ b/skin/classic/treestyletab/ui-base.css
@@ -320,7 +320,6 @@ tabbrowser[treestyletab-tabbar-position="bottom"]
 
 /* pinned tabs */
 .tabbrowser-tabs[treestyletab-mode="vertical"][positionpinnedtabs="true"] {
-	padding-start: 0 !important;
 	-moz-padding-start: 0 !important;
 }
 
@@ -413,8 +412,6 @@ tabbrowser[treestyletab-tabbar-position="bottom"]
 	right: 0;
 	top: 0;
 	transition: 1s opacity ease-out;
-	transition: 1s opacity ease-out;
-	user-focus: ignore;
 	z-index: 99999;
 	-moz-user-focus: ignore;
 }
@@ -435,7 +432,6 @@ tabbrowser[treestyletab-tabbar-position="bottom"]
 	outline: transparent solid 0.2em;
 	outline-offset: -0.2em;
 	-moz-outline-radius: 0.25em;
-	outline-radius: 0.25em;
 }
 .tabbrowser-tab[treestyletab-highlighted='notifying'] {
 	outline: Highlight solid 0.2em;