Software Recommendation – How to Take a Screenshot Every N Seconds

Shutter

Shutter is a feature-rich screenshot program. You can take a screenshot of a specific area, window, your whole screen, or even of a website - apply different effects to it, draw on it to highlight points, and then upload to an image hosting site, all within one window.

You can set the size of default selection in it's Preferences. Go to Edit > Preferences > Advanced and change the value of start with selection size of.

You can get more details about Shutter on it's website.

On recent versions of Firefox, there is no need for any plugins. This capability is built into the browser.

1. In Firefox, use Ctrl+Shift+F2 to open the Web Developer Console.
2. Type :screenshot --fullpage (this will autocomplete, so :s Tab --fullpage will work).

That will save the screenshot as a PNG file to your downloads folder. By default, the filename includes the date and time. You can use a different filename if you wish, simply by passing it in on the CLI: :screenshot --fullpage my_name.png.

This will also work on pop-up windows, but each window will need to be saved individually. I know of no way to combine them into a single screenshot. (You could, of course, do that in GIMP or another image-editing tool later.)