diff --git a/.mozilla/firefox/profile/chrome/color.css b/.mozilla/firefox/profile/chrome/color.css
deleted file mode 100644
index 7bf434b..0000000
--- a/.mozilla/firefox/profile/chrome/color.css
+++ /dev/null
@@ -1,4 +0,0 @@
-:root {
-  --color-background-dark: #1c1b22;
-  --color-shadow: black;
-}
diff --git a/.mozilla/firefox/profile/chrome/userChrome.css b/.mozilla/firefox/profile/chrome/userChrome.css
index 389ea82..fad58aa 100644
--- a/.mozilla/firefox/profile/chrome/userChrome.css
+++ b/.mozilla/firefox/profile/chrome/userChrome.css
@@ -1,4 +1,3 @@
-@import "color.css";
 @import "userChrome/sidebar.css";
 @import "userChrome/topbar.css";
 
diff --git a/.mozilla/firefox/profile/chrome/userChrome/sidebar.css b/.mozilla/firefox/profile/chrome/userChrome/sidebar.css
index e46d382..d371e6b 100644
--- a/.mozilla/firefox/profile/chrome/userChrome/sidebar.css
+++ b/.mozilla/firefox/profile/chrome/userChrome/sidebar.css
@@ -13,7 +13,7 @@
   > #sidebar:hover {
   min-width: 200px !important;
   max-width: 200px !important;
-  box-shadow: 0 0 10px var(--color-shadow);
+  box-shadow: 0 0 10px black;
 }
 #sidebar-box[sidebarcommand="_3c078156-979c-498b-8990-85f7987dd929_-sidebar-action"]
   > #sidebar {
diff --git a/.mozilla/firefox/profile/chrome/userChrome/topbar.css b/.mozilla/firefox/profile/chrome/userChrome/topbar.css
index 6f0b61e..cc1ad9a 100644
--- a/.mozilla/firefox/profile/chrome/userChrome/topbar.css
+++ b/.mozilla/firefox/profile/chrome/userChrome/topbar.css
@@ -1,6 +1,6 @@
-/* 隐藏标签栏 */
+/* 隐藏标签栏 (标签栏嵌入标题栏的情况除外) */
 #main-window:not([tabsintitlebar="true"]) #TabsToolbar {
-  visibility: collapse;
+  display: none;
 }
 
 /* 去除工具栏最左和最右的空白边距 */
@@ -13,11 +13,17 @@
   --toolbarbutton-outer-padding: 0 !important;
 }
 
-/* 减小工具栏的高度 */
+/* 强制设置工具栏的高度为固定值 */
 #nav-bar {
   max-height: 25px !important;
 }
 
+/* 修复工具栏中的前进后退图标 (为什么特殊？) */
+#nav-bar .toolbarbutton-icon[type="menu"] {
+  padding: 4px !important;
+  border-radius: 0 !important;
+}
+
 /* 只在Hover时显示地址栏右侧的扩展图标 */
 #nav-bar:not(:hover) #urlbar-container ~ .toolbaritem-combined-buttons {
   opacity: 0;
diff --git a/.mozilla/firefox/profile/chrome/userContent.css b/.mozilla/firefox/profile/chrome/userContent.css
deleted file mode 100644
index add333a..0000000
--- a/.mozilla/firefox/profile/chrome/userContent.css
+++ /dev/null
@@ -1,7 +0,0 @@
-@import "color.css";
-
-@-moz-document url("about:blank"), url("about:newtab") {
-  body {
-    background-color: var(--color-background-dark) !important;
-  }
-}