Grab the main page with all the links:
curl https://slackmojis.com/ > emoji
Open file in vim and run the following commands:
v/src=/d
%s/^.*http:/http:/g"
%s/?.*$/d
%s/?.*$//g
This deletes any line that doesn't start with src, deletes everything before http:, and delets anything after ?.
Now loop over each URL and download the image:
while read emoji; do
curl -O $emoji;
done <../emoji
Install Slack Emoji Tools Chrome extension.
Drag all your emoji into the bulk upload box and then flip your machine over and fry some bacon, cuz it's gonna get hot!