Examine source code of Functional Slide Rule

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxPersona-BLZ-SlideRule-header-NoBG.png"
    },
    "colors": {
      "frame": "#2e0035",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Functional Slide Rule",
  "manifest_version": 2,
  "description": "This is an actual functioning slide rule to multiply, divide, find squares and roots.  Ctrl-F to show sliding scale D, then move window bottom up until scale D meets scale C, then move window sides to slide scale D along scale C to multiply &amp; divide. Read squares and roots directly from scales B and C.  Works best at higher screen resolutions; toolbars set for no tabs on top and 100 pixels of header showing.\n\nTo rate or comment, login here:\n<a href=\"https://addons.mozilla.org/en-US/firefox/addon/functional-slide-rule/#id=306364\" rel=\"nofollow\">https://addons.mozilla.org/en-US/firefox/addon/functional-slide-rule/#id=306364</a> \nSee all my personas here:\n<a href=\"https://addons.mozilla.org/en-US/firefox/collections/BrianZ/personas/\" rel=\"nofollow\">https://addons.mozilla.org/en-US/firefox/collections/BrianZ/personas/</a> \n\n (c) 2011 BrianZ"
}