It was working up to v28.8.4.
The html at the top of the frame is now displayed as html tags instead of rendered html. Here is example
<html><head><link rel='stylesheet' href='chrome://updatescan/skin/diffPage.css' type='text/css'/></head><body><b>View:</b>
<a href='chrome://updatescan/content/diffPage.xul?id=1293&title=Pale%20Moon%20-%20Release%20Notes&newDate=today%20at%2018%3A04&oldDate=today%20at%2011%3A51&url=https%3A//www.palemoon.org/releasenotes.shtml&view=old' target='_top'>Old Page</a>
<a href='chrome://updatescan/content/diffPage.xul?id=1293&title=Pale%20Moon%20-%20Release%20Notes&newDate=today%20at%2018%3A04&oldDate=today%20at%2011%3A51&url=https%3A//www.palemoon.org/releasenotes.shtml&view=new' target='_top'>New Page</a>
<b>Changes</b>
<a href='https://www.palemoon.org/releasenotes.shtml' target='_top'>Current Page</a>
</body></html>
update scanner v3.3.2
Update Scanner Broke w/28.9.x
Moderators: FranklinDM, Lootyhoof
Re: Update Scanner Broke w/28.9.x
As Tobin says, "learn2code".