Capture a screenshot of your current page in entirety and reliably—without requesting any extra permissions! Check out or download GoFullPage.
This is a really simple way of taking a full-page screenshot of your current browser window. Click on the extension icon (or press Alt+Shift+P), watch the extension capture each part of the page, and be transported to a new tab of your screenshot where you can download it as an image or PDF or even just drag it to your desktop.
Alternatively if you’d like to record a video of your screen, Scre.io is a good plugin for this.