Examine source code of DragFactor v3

{
  "theme": {
    "images": {
      "theme_frame": "dragfactor_v1_22-24_inch_monitors.jpg"
    },
    "colors": {
      "frame": "#a6a3a3",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "DragFactor v3",
  "manifest_version": 2,
  "description": "version 3, suit 22-24 inch monitors better"
}