diff --git a/css/leptonChrome.css b/css/leptonChrome.css
index 267a792..43704c4 100644
--- a/css/leptonChrome.css
+++ b/css/leptonChrome.css
@@ -2004,6 +2004,7 @@
     #label-box {
       align-items: center !important;
       -moz-box-align: center !important;
+      justify-content: center !important;
       -moz-box-pack: center !important;
       font-weight: 600 !important;
     }
@@ -7637,6 +7638,7 @@
     position: absolute !important;
   }
   #nav-bar-customization-target {
+    justify-content: space-between;
     -moz-box-pack: justify;
   }
   #nav-bar {
diff --git a/src/navbar/_as_sidebar.scss b/src/navbar/_as_sidebar.scss
index 8d813d4..05ef66b 100644
--- a/src/navbar/_as_sidebar.scss
+++ b/src/navbar/_as_sidebar.scss
@@ -21,7 +21,7 @@
 }
 
 #nav-bar-customization-target {
-  -moz-box-pack: justify;
+  @include BoxPack("justify");
 }
 #nav-bar {
   // --toolbarbutton-outer-padding: 0px !important;
diff --git a/src/theme/proton_chrome/_proton_commons.scss b/src/theme/proton_chrome/_proton_commons.scss
index a80aad3..1d246a2 100644
--- a/src/theme/proton_chrome/_proton_commons.scss
+++ b/src/theme/proton_chrome/_proton_commons.scss
@@ -279,7 +279,7 @@
 
   #label-box {
     @include BoxAlign("center", true);
-    -moz-box-pack: center !important;
+    @include BoxPack("center", true);
     font-weight: 600 !important;
   }