Examine source code of Better Jira

{
  "browser_action": {
    "default_icon": "icon_16.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "css": [
        "dist/css/content.css",
        "dist/css/standup.css"
      ],
      "js": [
        "dist/js/better-jira.js"
      ],
      "matches": [
        "https://*/*"
      ]
    }
  ],
  "icons": {
    "16": "icon_16.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "description": "Much needed interface improvements for Jira",
  "manifest_version": 2,
  "name": "Better Jira",
  "permissions": [
    "https://*.atlassian.net/*",
    "storage"
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1.5.3",
  "browser_specific_settings": {
    "gecko": {
      "id": "{65ae3c69-8105-404c-9a75-8ae3fe16e6c8}"
    }
  }
}