Aquarium

This is my first and personal theme for Firefox. It was made in Firefox Color and i put a lot of work into this theme so please give your honest opinion and i will try and make it better. It should resemble water from a aquarium.
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manifest.json
{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Aquarium",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 33, 52)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 33, 45)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 187, 255)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "frame_inactive": "rgb(0, 255, 248)",
      "icons_attention": "rgb(0, 100, 255)",
      "icons": "rgb(0, 187, 255)",
      "tab_loading": "rgb(0, 187, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{13e5b901-677a-4d72-81e8-0825d76e873e}"
    }
  }
}