firefox-extensions.default-zoom: tune defaultZoom, 2.0 -> 1.7

pkgs/by-name/firefox-extensions/default-zoom/background.js

@@ -4,7 +4,10 @@
 // it works for the homepage too, except for a first-run edge case wherein the homepage is loaded
 // before any extensions are loaded
 //
-let defaultZoom = 2.0;
+// considerations:
+// - desko: youtube.com is most comfortable 1.6 - 1.8
+// - desko: wikipedia.org is most comfortable 1.7 - 1.9
+let defaultZoom = 1.7;
 
 function setZoom(tabId, changeInfo) {
   if (changeInfo.status) {