Examine source code of Add JIRA Internal Comment

{
  "manifest_version": 2,
  "name": "Add JIRA Internal Comment",
  "version": "3.9.0",
  "description": "Adds a checkbox to insert #internal# text into JIRA's comment.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{6b56cf89-89e3-a49b-09ff-d5f18fd4dcc0}"
    }
  },
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/jira/*",
        "https://*/jira/*"
      ],
      "js": [
        "jquery.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "jquery.js"
  ]
}