Examine source code of Hummingbirds...

{
  "theme": {
    "images": {
      "theme_frame": "Hummingbirds_header_byLisa.png"
    },
    "colors": {
      "frame": "#638457",
      "tab_background_text": "#ffdfff"
    }
  },
  "version": "2.0",
  "name": "Hummingbirds...",
  "manifest_version": 2,
  "description": "broad-tailed hummingbirds, cactus blossom\n\nchild friendly persona\n\nPersonas by LisaAtTheBeach"
}