diff --git a/platform/Linux/chrome.manifest b/platform/Linux/chrome.manifest
index fb2f8baa..c61c545d 100644
--- a/platform/Linux/chrome.manifest
+++ b/platform/Linux/chrome.manifest
@@ -1,3 +1,4 @@
 skin	treestyletab-platform	classic/1.0	jar:chrome/treestyletab.jar!/skin/classic/treestyletab/
 
+style chrome://browser/content/browser.xul chrome://treestyletab-platform/skin/treestyletab-3.css appversion>=3.0b3pre
 style chrome://browser/content/browser.xul chrome://treestyletab-platform/skin/treestyletab-3.5.css appversion>=3.1b3pre
diff --git a/platform/Linux/skin/classic/treestyletab/treestyletab-3.css b/platform/Linux/skin/classic/treestyletab/treestyletab-3.css
new file mode 100644
index 00000000..8412e463
--- /dev/null
+++ b/platform/Linux/skin/classic/treestyletab/treestyletab-3.css
@@ -0,0 +1,11 @@
+@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
+
+tabbrowser[treestyletab-style~="square"][treestyletab-tabbar-position="left"]:not([treestyletab-tabbar-transparent="full"]) .tabbrowser-strip {
+	border-right: 1px solid ThreeDShadow !important;
+	-moz-border-right-colors: none !important;
+}
+tabbrowser[treestyletab-style~="square"][treestyletab-tabbar-position="right"]:not([treestyletab-tabbar-transparent="full"]) .tabbrowser-strip {
+	border-left: 1px solid ThreeDShadow !important;
+	-moz-border-right-colors: none !important;
+}
+
diff --git a/skin/classic/treestyletab/square.css b/skin/classic/treestyletab/square.css
index 3f0887a3..d7277eb3 100644
--- a/skin/classic/treestyletab/square.css
+++ b/skin/classic/treestyletab/square.css
@@ -20,11 +20,11 @@ tabbrowser[treestyletab-style~="square"][treestyletab-mode="vertical"] .tabs-con
 
 tabbrowser[treestyletab-style~="square"][treestyletab-tabbar-position="left"][treestyletab-tabbar-fixed="true"]:not([treestyletab-tabbar-transparent="full"]) .tabbrowser-strip {
 	border-right: 1px solid ThreeDShadow !important;
-	-moz-border-right-colors: ThreeDShadow !important;
+	-moz-border-right-colors: none !important;
 }
-tabbrowser[treestyletab-style][treestyletab-tabbar-position="right"][treestyletab-tabbar-fixed="true"]:not([treestyletab-tabbar-transparent="full"]) .tabbrowser-strip {
+tabbrowser[treestyletab-style~="square"][treestyletab-tabbar-position="right"][treestyletab-tabbar-fixed="true"]:not([treestyletab-tabbar-transparent="full"]) .tabbrowser-strip {
 	border-left: 1px solid ThreeDShadow !important;
-	-moz-border-left-colors: ThreeDShadow !important;
+	-moz-border-left-colors: none !important;
 }
 
 tabbrowser[treestyletab-style~="square"][treestyletab-mode="vertical"] .tabs-bottom,