Only for images AND a problem. Rated 5 out of 5 stars

I don't know if this bug is on all versions of FF (I use 3.6.8). When I press Ctrl PgDn to focus another tab, it makes a page down before the Ctrl PgDn focus other tab. Please fix it.

AND please add some other options:
- Scroll only through IMAGES (for a fast image view) using size limits. Because it's not nice to have to scroll through the small images.
- A keyboard shortcut to enable or disable if the commented bug is still present.