make some styles less dependent on color-mix pref

chrome/curved_tabs.css

@@ -18,9 +18,7 @@ See the above repository for updates as well as full license text. */
 
 #TabsToolbar{ --toolbarbutton-inner-padding: 6px !important; }
 
-.tabbrowser-tab:hover{ --uc-tab-fill: rgba(0,0,0,.1) }
 .tabbrowser-tab[selected]{ --uc-tab-curve-padding: 1px } 
-#TabsToolbar[brighttext] .tabbrowser-tab:hover{ --uc-tab-fill: rgba(255,255,255,.1) }
 .titlebar-spacer[type="pre-tabs"],
 .tabbrowser-tab::after{ border: none !important; }
 
@@ -33,7 +31,7 @@ See the above repository for updates as well as full license text. */
   display: block;
   position: absolute;
   content: "";
-  fill: var(--uc-tab-fill);
+  fill: color-mix(in srgb, currentColor 11%, transparent);
   -moz-context-properties: fill,stroke;
   left: calc(var(--uc-tab-curve-padding,0px) - var(--uc-tab-curve-size));
   background-image: url("data:image/svg+xml;base64,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");
@@ -81,9 +79,11 @@ See the above repository for updates as well as full license text. */
 .tabbrowser-tab[last-visible-tab]{ margin-inline-end: var(--uc-tab-curve-size) !important; }
 
 /* OPTIONAL - COLORS - show tabs border, selected tab line and make selected tab match the main toolbar color. Also disables tab shadow */
+/* Using these color options requires you to set layout.css.color-mix.enabled to true in about:config  */
 /*
 #navigator-toolbox{ --tabs-border-color: color-mix(in srgb, currentcolor, transparent 80%) !important; }
 #tabbrowser-tabs{ --lwt-selected-tab-background-color: var(--toolbar-bgcolor) }
+.tab-background[selected]{ --toolbar-bgcolor: transparent }
 .tabbrowser-tab .tab-background{ border-top: none !important; box-shadow: none !important; }
 
 .tab-background[selected]::before{

chrome/non_floating_sharp_tabs.css

@@ -3,11 +3,9 @@ See the above repository for updates as well as full license text. */
 
 /* This style makes tabs and related items non-rounded and connects tabs to toolbars like in previous Firefox versions. */
 
-/* It's not strictly a requirement, but this style expects  compact_proton.css to be loaded before it. */
+/* It's not strictly a requirement, but this style expects compact_proton.css to be loaded before it. */
 
-/* NOTE: go to about:config and enable layout.css.color-mix.enabled, this doesn't work properly without it. */
+:root[id]{
-
-:root{
   --proton-tab-block-margin: 0px !important;
   --tab-block-margin: 0px !important;
   --tabs-shadow-size: 1px !important;
@@ -19,14 +17,13 @@ See the above repository for updates as well as full license text. */
   /* --tab-line-color: blue !important; */ 
 }
 
-/* This sets a color for border around tabs and between tabs & navigation toolbars. Set to transparent to remove the border.*/
+/* These next two rules set a color for border around tabs and between tabs & navigation toolbars. Set to transparent to remove the border.*/
-#navigator-toolbox{
-  --tabs-border-color: color-mix(in srgb, currentcolor 30%, transparent) !important;
-}
-
-/* This overrides value in compact_proton.css */
 #nav-bar{
-  box-shadow: 0 -1px 0 0 var(--tabs-border-color) !important;
+  /* This overrides value in compact_proton.css */
+  box-shadow: 0 -1px 0 0 color-mix(in srgb, currentcolor 30%, transparent) !important;
+}
+.tab-background[selected]{
+  border-inline: 1px solid color-mix(in srgb, currentcolor 30%, transparent) !important;
 }
 
 #TabsToolbar{
@@ -65,9 +62,6 @@ See the above repository for updates as well as full license text. */
   border-radius: 0 !important;
   box-shadow: none !important;
 }
-.tab-background[selected]{
-  border-inline: 1px solid var(--tabs-border-color) !important;
-}
 
 /* Line to mark selected tab */
 .tab-background[selected]::before,

chrome/tab_separator_lines.css

@@ -5,8 +5,14 @@ See the above repository for updates as well as full license text. */
 
 .tabbrowser-tab{
   border-inline-end: 1px solid transparent !important;
-  border-image: 0 1 linear-gradient(transparent 20%,var(--toolbarseparator-color) 20%,var(--toolbarseparator-color) 80%,transparent 80%);
+  border-image: 0 1 linear-gradient(
+    transparent 20%,
+    color-mix(in srgb, currentColor 20%, transparent) 20%,
+    color-mix(in srgb, currentColor 20%, transparent) 80%,
+    transparent 80%
+  );
 }
+
 .tabbrowser-tab:hover,
 .tabbrowser-tab[beforehovered],
 .tabbrowser-tab[selected],