Examine source code of [TST] Colorize Tabs

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "TST Colorize Tabs",
  "version": "2.0.0",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://github.com/irvinm/TST-Colorize-Tabs",
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": "images/color.png",
    "default_popup": "options/options.html"
  },
  "icons": {
    "128": "images/color.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tst_colorize_tabs@emvaized.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "menus",
    "tabs",
    "storage",
    "sessions"
  ],
  "commands": {
    "next-tab-with-color": {
      "suggested_key": {
        "default": "Alt+Down"
      },
      "description": "Switch to the next colorized tab"
    },
    "previous-tab-with-color": {
      "suggested_key": {
        "default": "Alt+Up"
      },
      "description": "Switch to the previous colorized tab"
    },
    "red": {
      "suggested_key": {
        "default": "Alt+1"
      },
      "description": "Color tabs red"
    },
    "green": {
      "suggested_key": {
        "default": "Alt+2"
      },
      "description": "Color tabs green"
    },
    "blue": {
      "suggested_key": {
        "default": "Alt+3"
      },
      "description": "Color tabs blue"
    },
    "yellow": {
      "suggested_key": {
        "default": "Alt+4"
      },
      "description": "Color tabs yellow"
    },
    "brown": {
      "suggested_key": {
        "default": "Alt+5"
      },
      "description": "Color tabs brown"
    },
    "purple": {
      "suggested_key": {
        "default": "Alt+6"
      },
      "description": "Color tabs purple"
    },
    "orange": {
      "suggested_key": {
        "default": "Alt+7"
      },
      "description": "Color tabs orange"
    },
    "noColor": {
      "suggested_key": {
        "default": "Alt+0"
      },
      "description": "Remove all colors"
    }
  }
}