Just discovered a nice and simple way to refresh the browser. Just let your html file do the work. No need for add-ons/extensions.
Add this one line to the head:
<meta http-equiv="refresh" content="1" >
To which I added this comment : <!--REMOVE '1' WHEN READY, BEFORE UPLOADING !-->
The '1' stands for a 1 second refresh interval. You can of course choose the interval you prefer. With the 1 second interval the tab is blinking contnuously.. I had to cover the top part of my screen with a small piece of paper to regain calmness ;)
Bert