Examine source code of Solo Leveling

{
  "name": "Solo Leveling",
  "manifest_version": 2,
  "version": "7.0",
  "theme": {
    "images": {
      "theme_frame": "Solo Leveling Theme [Firefox] 1919x211.jpg"
    },
    "colors": {
      "frame": "rgba(5, 5, 5, 0)",
      "tab_background_text": "rgba(43, 51, 166, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(43, 51, 166, 1)"
    }
  }
}