diff --git a/browser/themes/shared/tabbrowser/tabs.css b/browser/themes/shared/tabbrowser/tabs.css
index 9a915ff442cc7f01ddec3fcea931c21e210cac92..3671d924f05c74e21be60a9acf58e14f69630d53 100644
--- a/browser/themes/shared/tabbrowser/tabs.css
+++ b/browser/themes/shared/tabbrowser/tabs.css
@@ -39,7 +39,7 @@
 
 #tabbrowser-tabs {
   --tab-min-width: 76px;
-  --tab-loading-fill: #0A84FF;
+  --tab-loading-fill: var(--zen-primary-color);
   --tab-overflow-pinned-tabs-width: 0px;
   padding-inline: var(--tab-overflow-pinned-tabs-width) 0;
   /* Use a bigger flex value than the searchbar to prevent it from
@@ -103,7 +103,7 @@
    * (we only have 2px padding in the inline direction) */
   overflow-clip-margin: 2px;
 
-  &:not([pinned]) {
+  & {
     flex: 100 100;
     max-width: 225px;
     min-width: var(--tab-min-width);
@@ -126,7 +126,7 @@
     flex-shrink: 0;
 
     #tabbrowser-tabs[positionpinnedtabs] > #tabbrowser-arrowscrollbox > & {
-      position: absolute !important;
+      /*position: absolute !important;*/
       display: block;
     }
   }
@@ -360,7 +360,7 @@
   &[selected]:not([src], [pinned], [crashed], [pictureinpicture]),
   &:not([src], [pinned], [crashed], [sharing], [pictureinpicture]),
   &[busy] {
-    display: none;
+    /*display: none;*/
   }
 }
 
@@ -627,7 +627,7 @@
 
 #tabbrowser-tabs[haspinnedtabs]:not([positionpinnedtabs]) > #tabbrowser-arrowscrollbox > .tabbrowser-tab:nth-child(1 of :not([pinned], [hidden])) {
   /* Add a gap between the last pinned tab and the first visible tab */
-  margin-inline-start: 12px !important; /* .tabbrowser-tab sets margin: 0 !important; */
+  margin-inline-start: 0 !important; /* .tabbrowser-tab sets margin: 0 !important; */
 }
 
 .tab-label[attention]:not([selected]) {
@@ -737,6 +737,7 @@
 .titlebar-spacer[type="pre-tabs"],
 .titlebar-spacer[type="post-tabs"] {
   width: 40px;
+  display: none !important;
 }
 
 @media (max-width: 500px) {
@@ -752,7 +753,7 @@
   toolbarbutton:not(#firefox-view-button),
   toolbarpaletteitem:not(#wrapper-firefox-view-button)
 ) + #tabbrowser-tabs {
-  border-inline-start: 1px solid color-mix(in srgb, currentColor 25%, transparent);
+  border-inline-start: transparent;
   padding-inline-start: calc(var(--tab-overflow-pinned-tabs-width) + 2px);
   margin-inline-start: 2px;
 }