Examine source code of Focus Reminder

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.0.2",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "48": "icons/target-48x48.png",
    "96": "icons/target-96x96.png"
  },
  "permissions": [
    "tabs",
    "alarms"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/target-16x16.png",
      "32": "icons/target-32x32.png",
      "64": "icons/target-64x64.png"
    },
    "default_title": "__MSG_browserActionTitle__",
    "default_popup": "dialog/dialog.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/*.svg",
    "popup/*"
  ],
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{9a601154-3f4c-4635-813e-f7715d381764}"
    }
  }
}