diff --git a/src/opnsense/mvc/app/views/OPNsense/Core/firmware.volt b/src/opnsense/mvc/app/views/OPNsense/Core/firmware.volt
index a3ff5ec02..c41bae934 100644
--- a/src/opnsense/mvc/app/views/OPNsense/Core/firmware.volt
+++ b/src/opnsense/mvc/app/views/OPNsense/Core/firmware.volt
@@ -742,7 +742,7 @@ POSSIBILITY OF SUCH DAMAGE.
             </ul>
             <div class="tab-content content-box tab-content">
                 <div id="updates" class="tab-pane fade in active">
-                    <textarea name="output" id="update_status" class="form-control" rows="25" wrap="hard" readonly style="max-width:100%; font-family: monospace; display: none;"></textarea>
+                    <textarea name="output" id="update_status" class="form-control" rows="25" wrap="hard" readonly="readonly" style="max-width:100%; font-family: monospace; display: none;"></textarea>
                     <table class="table table-striped table-condensed table-responsive" id="updatelist">
                         <thead>
                         </thead>
diff --git a/src/www/firewall_schedule_edit.php b/src/www/firewall_schedule_edit.php
index 47337644c..b2e84b7e2 100644
--- a/src/www/firewall_schedule_edit.php
+++ b/src/www/firewall_schedule_edit.php
@@ -626,15 +626,15 @@ function insertElements(tempFriendlyTime, starttimehour, starttimemin, stoptimeh
     tr.appendChild(td);
 
     td = d.createElement("td");
-    td.innerHTML="<input type='text' readonly name='starttime" + schCounter + "' id='starttime" + schCounter + "' style=' word-wrap:break-word; width:100%; border:0px solid;' value='" + starttimehour + ":" + starttimemin + "' />";
+    td.innerHTML="<input type='text' readonly='readonly' name='starttime" + schCounter + "' id='starttime" + schCounter + "' style=' word-wrap:break-word; width:100%; border:0px solid;' value='" + starttimehour + ":" + starttimemin + "' />";
     tr.appendChild(td);
 
     td = d.createElement("td");
-    td.innerHTML="<input type='text' readonly name='stoptime" + schCounter + "' id='stoptime" + schCounter + "' style=' word-wrap:break-word; width:100%; border:0px solid;' value='" + stoptimehour + ":" + stoptimemin + "' />";
+    td.innerHTML="<input type='text' readonly='readonly' name='stoptime" + schCounter + "' id='stoptime" + schCounter + "' style=' word-wrap:break-word; width:100%; border:0px solid;' value='" + stoptimehour + ":" + stoptimemin + "' />";
     tr.appendChild(td);
 
     td = d.createElement("td");
-    td.innerHTML="<input type='text' readonly name='timedescr" + schCounter + "' id='timedescr" + schCounter + "' style=' word-wrap:break-word; width:100%; border:0px solid;' value='" + tempdescr + "' />";
+    td.innerHTML="<input type='text' readonly='readonly' name='timedescr" + schCounter + "' id='timedescr" + schCounter + "' style=' word-wrap:break-word; width:100%; border:0px solid;' value='" + tempdescr + "' />";
     tr.appendChild(td);
 
     td = d.createElement("td");
diff --git a/src/www/system_usermanager.php b/src/www/system_usermanager.php
index 992c5f97f..0d8e18ad6 100644
--- a/src/www/system_usermanager.php
+++ b/src/www/system_usermanager.php
@@ -587,7 +587,7 @@ $( document ).ready(function() {
                   <tr>
                     <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("User distinguished name");?></td>
                     <td>
-                      <input name="user_dn" type="text" class="formfld user" id="user_dn" size="20" value="<?=$pconfig['user_dn'];?>"/ readonly>
+                      <input name="user_dn" type="text" class="formfld user" id="user_dn" size="20" value="<?=$pconfig['user_dn'];?>" readonly="readonly" />
                     </td>
                   </tr>
 <?php