diff --git a/src/view/form.js b/src/view/form.js
index b177c851b8..0b33ff6782 100644
--- a/src/view/form.js
+++ b/src/view/form.js
@@ -1691,7 +1691,10 @@ function eval_pyson(value){
                     value = this._parse(this._input_format, value);
                     value = this._format(this.get_format(), value);
                     this.date.val(value).change();
-                    this.date.focus();
+                    if (!~navigator.userAgent.indexOf("Firefox")) {
+                        // Firefox triggers change when navigate by month/year
+                        this.date.focus();
+                    }
                 }
                 this.send_modified();
             });
@@ -1700,6 +1703,7 @@ function eval_pyson(value){
                     'class': 'icon-input icon-secondary',
                     'aria-label': Sao.i18n.gettext("Open the calendar"),
                     'title': Sao.i18n.gettext("Open the calendar"),
+                    'tabindex': -1,
                 }).appendTo(group);
                 this.input.appendTo(this.icon);
                 Sao.common.ICONFACTORY.get_icon_img('tryton-date')