Examine source code of Emojit

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "1.2.0",
  "short_name": "__MSG_appShortName__",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "128": "images/icon128.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "images/icon128.png",
    "default_title": "__MSG_browserActionTitle__",
    "default_popup": "pages/browser_action.html"
  },
  "options_page": "pages/home.html",
  "options_ui": {
    "page": "pages/home.html",
    "open_in_tab": true,
    "browser_style": true,
    "chrome_style": true
  },
  "permissions": [
    "storage",
    "tabs",
    "https://api.emojit.site/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "emojit@emojit.site"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "windows": "Ctrl+Shift+A",
        "mac": "Command+Shift+A",
        "chromeos": "Ctrl+Shift+A",
        "linux": "Ctrl+Shift+A"
      }
    }
  }
}