Takes the start and stop points of a YouTube video, down to the frame, and gives the time between them in the format
1h 23m 45s 678ms. Based on the work of slashinfty, with changes made to phrasing and overall style -
the original source code is here,
and the original implementation is here.
Right-click the YouTube video and select "Stats for nerds". The third line is "Current / Optimal Res" - find the two numbers after the @ and enter them for framerate.
Find the starting point, using the , and . keys to find the exact frame. Right-click
the video, select "Copy debug info", and paste it into the starting frame textbox. Repeat for ending frame.