For a tester this is important to visualize the defects using pictures, videos etc. I would like to share one important tool that i used to take the screenshot of a full web page. Which is hard using some tools.

In chrome – use awesome screenshots

https://chrome.google.com/webstore/detail/awesome-screenshot-captur/alelhddbbhepgpmgidjdcjakblofbmce?hl=en

Use full web page in the options.

Mozilla use same plugin

https://addons.mozilla.org/en-US/firefox/addon/awesome-screenshot-capture-/

or use

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

There are some other online options like

http://capturefullpage.com/

http://www.faststone.org/FSCaptureDetail.htm desktop