High Sierra: How to resize window taller than screen? I'm trying to capture a screenshot of a browser window, where the page content is quite tall.

In Sierra, I could drag the window down, and then resize from the top of the window (moving up). I could repeat this process until the window was tall enough to contain all of the page content, and then take a screenshot of the browser window.

In High Sierra, at the completion of any vertical resize operation that results in the window being taller than the active display, the window snaps to the size of the active display.

I've tried browser extensions that cause window resizing, and an AppleScript that tells the browser to resize. On a MacBook Pro and a 27" 5K iMac. To no avail.

Does anyone have a solution? In the meantime, I guess I'll be stitching multiple screenshots together.
I've always used a program called Paparazzi to take pictures of websites:
https://paparazzi.en.softonic.com/mac