Examine source code of Linfield Persona 2

{
  "theme": {
    "images": {
      "theme_frame": "LinPERheader03.png"
    },
    "colors": {
      "frame": "#e80000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Linfield Persona 2",
  "manifest_version": 2,
  "description": "My second Linfield persona for Firefox. Nothing fancy, bit of blue gradient and the Linfield badge."
}