I've moved this to the Feedback and Suggestion forum so TPF's tech people will be more likely to see your query.
Apparently you are adding your copyright statement/name in a way other than adding a text layer to the image?
This is a description of what Reveal software does -
Tabbed browsing is one of Firefox's best features, but after you've opened a dozen tabs or so, it's easy to lose track of them all. That's where Reveal comes in. Simply press F2 or Alt tilde, and this clever Firefox extension displays thumbnail images of your tabs. From there, you can jump to a given tab by clicking its thumbnail or selecting it with the keyboard. Reveal also provides a search bar that allows you to quickly filter tabs with keywords. Additional options let you set thumbnail dimensions and the maximum number of thumbnails. The images pop up instantly on a modern PC. For casual users, Reveal may be little more than eye candy, but for hard-core surfers who keep 15 or 20 tabs going at once, it's a great way to save time.
Read more: Reveal - CNET Download.com Reveal - CNET Download.com