Could have been best... Rated 3 out of 5 stars

It could simply be the best if some bugs are fixed...
- Snapping WON'T work for pages with FRAMES. This MUST be fixed...
- There's no mechanism for full page selection other than looong dragging. Either start with full page selection or provide a pointer to click (like center of selection box) for full page expansion...
- Since Snapper alters web page, page dimensions INCREASE if you're to drag selection box further from edges. It "should" simply be bound to current page size not limitless...
- Above situation is repeated in "manual dimensioning", mostly unknown; simply enter values on "dimension text", and values like 10000x10000 could not be entered unless they're real page dimensions...
- A feature; "manual positioning" in addition to 'manual dimensioning' will be greatly appreciated for more functionality...
- Although JPG is more standard, for text readability and size considerations PNG should be 'default' since in looong pages the difference becomes significant...
- A toolbar icon will also be greatly appreciated...

Until above bugs (some critical) are fixed you can try Abduction, Screenshot Pimp or the overrated ScreenGrab. Yet once fixed Snapper can beat them all...

Responding to the previous 2 posts: What Java are you talking about? I've never installed Java for years and Snapper works just fine... Try Java disabling or such for further examining...

This review is for a previous version of the add-on (2.0.2). 

Great suggestions

Thanks for the feedback. I've taken a lot of them to heart, and have included fixes for them in version 2.1 (which is currently being reviewed).

Snapper 2.1 will allow users to snap an entire webpage, without having to specify any dimensions. Users will be able to have better control over snapping webpages that contain frames (snapping the entire contents of a single frame, or even snapping an area that spans several frames).

Also, I have designated the PNG image format as the default for snapped images, although this setting can be modified by users in the "Options" window (to choose between PNG or JPG as default).

I will try to add boundaries in a future release, as well as a toolbar icon. If you have any other suggestions, or feedback, please post them here (or drop me an email at the address shown in the listing).