Screengrab is a Firefox add-on that allows you to make a screenshot of the website you are currently viewing, regardless it’s a selection or the entire website, and save every web page as a normal image file.

Screengrab is really light and easy to use: it fully integrates itself in the lower right part of Firefox’s interface and comes with two basic menu voices, which are completely identical in their content: Save and Copy.

As their name probably lets you guess, these two sections allow you to save the image you have just taken, or simply copy it to the clipboard in the other case.

Both of the two menus have three basic, identical functions:

1. Complete Page/Frame: this one allows you to take a screenshot of the entire page, no matter if you see it all or not. It will automatically scroll it down and capture it for you.
2. Visible Portion: as the name suggests, this function captures just what you see on your screen.
3. Selection: after you click this option, the screen will become all reddish. You can now select a region of the screen you wish to capture with your mouse, and you’re done.

Whether you select an option or the other, you will then be ready to save the image: if you were in the copy menu, you will then need to open an image editor and paste it. Else, a dialog box will show up, and it’ll let you give the file a name and an extension (image file format) to save it locally.

The plug-in is completely free to download and use.

Link: https://addons.mozilla.org/en-US/firefox/addon/1146