Fixed UI for full screen mode

src/toolkit/content/jar-mn.patch

@@ -1,11 +1,12 @@
 diff --git a/toolkit/content/jar.mn b/toolkit/content/jar.mn
-index 8b18c945253d00603891cc5f0b989476318e219c..3021de8ec32e32a9d58a207b4d279b236a264dbf 100644
+index 8b18c945253d00603891cc5f0b989476318e219c..c5368eec8d9a760c19a827fe7a4b9afb4b702976 100644
 --- a/toolkit/content/jar.mn
 +++ b/toolkit/content/jar.mn
-@@ -143,3 +143,6 @@ toolkit.jar:
+@@ -143,3 +143,7 @@ toolkit.jar:
  # Third party files
     content/global/third_party/d3/d3.js                (/third_party/js/d3/d3.js)
     content/global/third_party/cfworker/json-schema.js (/third_party/js/cfworker/json-schema.js)
 +
 +# Zen modules
 +   content/global/zen-xul.css
++   content/global/zen-fullscreen-override.css

src/toolkit/content/zen-fullscreen-override.css

@@ -0,0 +1,10 @@
+
+[inDOMFullscreen="true"] #nav-bar {
+  display: none !important;
+}
+
+[inDOMFullscreen="true"] #appcontent {
+  margin: 0 !important;
+  border-radius: 0 !important;
+}
+

src/toolkit/content/zen-xul.css

@@ -1,19 +1,25 @@
 
+@import url("zen-fullscreen-override.css");
+
 :root {
   --zen-main-browser-background: light-dark(#ddd, #4a4a4a); 
-  --zen-appcontent-separator-from-window: 20px;
+  --zen-appcontent-separator-from-window: 10px;
 }
 
-html#main-window > body > toolbox#navigator-toolbox, 
-hbox#browser {
+toolbox#navigator-toolbox, 
+#browser {
   background: transparent !important;
 } 
 
+#browser {
+  width: 100%;
+}
+
 html#main-window > body {
   background: var(--zen-main-browser-background) !important;
 }
 
-#appcontent {
+:not([inDOMFullscreen="true"]) #appcontent {
   border-radius: var(--zen-panel-radius);
   overflow: hidden;
   box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);