manifest.json

{
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "1.0.1",
  "manifest_version": 2,
  "default_locale": "en",

  "permissions": ["storage", "notifications"],
  
  "background": {
    "scripts": ["browser-polyfill.min.js", "shared.js", "background.js"],
    "persistent": false
  },

  "omnibox": { "keyword" : "!" },
  
  "browser_action": {
    "default_icon": {
      "16":  "icon16.png",
      "32":  "icon32.png"
    },
    "default_popup": "popup.html"
  },

  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+L"
      }
    }
  },

  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },

  "icons": {
    "16":  "icon16.png",
    "32":  "icon32.png",
    "48":  "icon48.png",
    "128": "icon128.png"
  },

  "browser_specific_settings": {
    "gecko": {
      "id": "{4397b935-aae4-4b2c-8afe-6655491dee56}",
      "strict_min_version": "42.0"
    },
    "edge": {
      "browser_action_next_to_addressbar": true
    }
  }
}