Examine source code of Pizza Ingredients

{
  "manifest_version": 2,
  "name": "Pizza Ingredients",
  "version": "1.1.1",
  "author": "Lilaflo <github@fackler.xyz>",
  "homepage_url": "https://digitalna-reka.rs",
  "description": "A delicious pizza-themed Firefox theme",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "theme": {
    "colors": {
      "frame": "#333333",
      "tab_background_text": "#FFFFFF",
      "toolbar": "#444444",
      "toolbar_text": "#FFFFFF",
      "toolbar_field": "#555555",
      "toolbar_field_text": "#FFFFFF",
      "toolbar_top_separator": "#333333",
      "toolbar_bottom_separator": "#333333",
      "toolbar_vertical_separator": "#333333"
    },
    "images": {
      "theme_frame": "pizza.png",
      "additional_backgrounds": [
        "pizza.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7a7e6bcf-0d15-4e58-bd72-c5aa31ac258f}"
    }
  }
}