Invert color the whole Gnome Desktop Environment for reading purposes. This extention use xcalib program for inverting the color, so you need to install xcalib first( in debian-based ditro you can use 'sudo apt-get install xcalib').
Note: Binary files aren't shown on the web site. To see all files, please download the extension zipfile.
You should put your extension code located on some server like github or something and the link on the metadata.json on the "url" field
invertDE