Examine source code of firefertext

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "firefertext",
  "manifest_version": 2,
  "description": "A simple theme made to enhance the readability of the buttons which I view as text and not icons. Colours chosen around the firefox button drop down so it doesn't stick out so much and now blends in with everything else as it's really not the thing I need catching my eye."
}