chore: Remove floating URL bar feature

src/browser/components/preferences/zen-settings.js

@@ -250,11 +250,6 @@ Preferences.addAll([
     type: "bool",
     default: true,
   },
-  {
-    id: "zen.theme.floating-urlbar",
-    type: "bool",
-    default: false,
-  },
   {
     id: "zen.keyboard.shortcuts.disable-firefox",
     type: "bool",

src/browser/components/preferences/zenLooksAndFeel.inc.xhtml

@@ -91,10 +91,6 @@
 
       <label><html:h2 data-l10n-id="zen-look-and-feel-urlbar-header"/></label>
       <description class="description-deemphasized" data-l10n-id="zen-look-and-feel-urlbar-description" />
-
-      <checkbox id="zenLooksAndFeelFloatingUrlbar"
-            data-l10n-id="zen-look-and-feel-floating-urlbar"
-            preference="zen.theme.floating-urlbar"/>
 </groupbox>
 
 </html:template>