Capture a set of images from your local token.
Install node: https://nodejs.org/en/download/
Clone this repository into its own directory.
Install dependencies:
npm install
Capture count images:
node fxsnapshot.js <count>
Use custom URL (http://localhost:3301/ by default):
node fxsnapshot.js --url="file://..." <count>
The script will work only if you use a canvas and call $fx.preview(). Your token must be launched in parallel.