This addon uses the code by MattWilcox/Adaptive-Images from GitHub It is used as supplied and all credit is with original author.
All this add-on does is allow you to install in as a module you can turn on and off.
Again totally standalone with no core code change. Once you have copied all the files over go into admin/Content /Modules and install “JcM Adaptive Images “ and turn it on.
You will have nothing to see as it just adds script. Go to a mobile device and view your site, browse around and then check your site files. You should have a directory /ai-cache and withing this will be other folders /100 /200 ect. To match your image widths. If this is true its working. If not check your config.
The script works but will mess up low quality images! So if your images are small to begin with not much point using this. As it scales up images to try and give a better view all you will get is a fussy mess!