Firefox tricks to take screenshot without any addon or tool

This tutorial will  helps you to take  screenshot right from Firefox without any
addon or third party tool

Step 1:
Open developer tool in Firefox(Ctr+shift+I)

Step 2:

Look for Responsive Design View in the menu

Step 3:

You can select which screen-size to take screenshot and just click on camera icon to take screenshot.

Here is few other shortcuts

Downloads	Ctrl + Shift + Y
Add-ons	Ctrl + Shift + A
Toggle Developer Tools	F12 Ctrl + Shift + I
Web Console	Ctrl + Shift + K
Inspector	Ctrl + Shift + C
Debugger	Ctrl + Shift + S
Style Editor	Shift + F7
Profiler	Shift + F5
Network	Ctrl + Shift + Q
Developer Toolbar	Shift + F2
Responsive Design View	Ctrl + Shift + M
Scratchpad	Shift + F4  <----- Try this
Page Source	Ctrl + U
Browser Console	Ctrl + Shift + J
Page Info	Ctrl + I

Get Full list at
https://support.mozilla.org/1/firefox/31.0/Linux/en-US/keyboard-shortcuts