- Download a .ZIP file (LINK).
- Extract the .zip file somewhere. Note where, you'll need it later.
- Got to Chrome's wrench icon in the top right corner and choose Tools > Extensions.
- At the top, on the right side, tick the box next to Developer mode.
- After ticking the box, a button labeled "Load unpacked extension..." should pop-up, press it.
- A file browser should pop up. Navigate to where you extracted the .zip file, select the folder and press OK.
- Open a tab and look for the Trello.com icon.
Stylized Trello icon remixed from trello_icon made by nathos