Generated Source not Working

I’m using Firefox, with Web Deveopers Extension Addon.
Its always worked OK in the past, but recently the Show Generated Source option shows only the static source.
The page shows a table read from a database, formatted and written to the page by javascript. The table displays as it should, but when I try to check something in the generated source using the addon, there’s nothing except the original source.
Any ideas anyone?

I suggest you use the support contact information provided in the add-on page to contact the developer.