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manifest.json

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Firefox Header Footer Grid Test",
  "manifest_version": 2,
  "description": "Created to coordinate theme image placements on header and footer of browser, Lavender area in header is my view area only. You may use this to figure your own visual area when creating themes and placing your main subject for display."
}