Taking Screenshots in the Windows is very easy, just press a keyboard button and get the screenshot in the clipboard. This way, you can take screenshots of both the web pages and in Windows OS. However, one problem is still in this way. You cannot take full site screenshots with this. If the site is scroll-able, then you have to do some hard job to take the whole site screenshot, by taking screenshots of the parts of the web page and then combining them together. Isn’t this a tedious task? Well, to help you in this situation here’s the solution for that.
Mozilla Firefox has an Add-on called Screengrab which can take the screenshot of the entire webpage without doing such cumbersome things. With the help of this add-on, you can easily take screenshots of the entire webpage, a part of the web page, an iFrame. It supports Flash, too hence you can take the flash site screenshots. To get you started, just download the add-on from the link given below.

Download: Screengrab for Mozilla Firefox

After installing the add-on, restart Firefox browser and then, Go to any website and let the website load entirely. Then, right-click on any empty area of the site and choose ScreenGrab!>>Save>>Complete Page/Frame. It will bring out a dialog box to save the screenshot. Just give a name to the screenshot and choose the folder where you want to save it. That’s it. The screenshot of the entire webpage has been taken! Here’s the screenshot I have taken with this add-on.

Besides this feature, it lets you take screenshots of the various options, such as to take only selected portion’s screenshot, etc.