Examine source code of Jira Hidebar

{
  "name": "Jira Hidebar",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "1.0",
  "manifest_version": 2,
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/browse/*",
        "*://*/issues",
        "*://*/issues/*",
        "*://*/*/issues",
        "*://*/*/issues/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "icons": {
    "16": "/images/jira_hidebar16.png",
    "32": "/images/jira_hidebar32.png",
    "48": "/images/jira_hidebar48.png",
    "128": "/images/jira_hidebar128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{357f8c9c-18e4-4526-a47c-7b22d4a8fbe4}"
    }
  }
}