'Web pages scanner' UI is better than similar 'SiteDelta Watch'.

But this addon have a big weak point.
I used "Scan a part of the page" option for software update version number check of webpages, but this addon save entire page content regardless of that option, so you can see backup file is so big size. but SiteDelta Watch just save a part of the page, so size is small. I have hundreds of lists for software updates check, then this is a big problem in performance and manage.