don't refresh boards if doc hidden

static-data/www/board/autorefresh.js

@@ -1,6 +1,24 @@
+/*
+    Onionr - Private P2P Communication
+
+    Auto refresh board posts
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
 var checkbox = document.getElementById('refreshCheckbox')
 function autoRefresh(){
-    if (! checkbox.checked){return}
+    if (! checkbox.checked || document.hidden){return}
     getBlocks()
 }