Examine source code of Jira Toggle Issue Sidebar

{
  "manifest_version": 2,
  "name": "Jira Toggle Issue Sidebar",
  "version": "0.9",
  "description": "Adds a 'Hide/Show' button to 'Browse' and 'Issues' Jira pages",
  "applications": {
    "gecko": {
      "strict_min_version": "58.0"
    }
  },
  "browser_action": {
    "default_title": "Jira Toggle Issue Sidebar"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/browse/*",
        "*://*/projects/*/issues*"
      ],
      "js": [
        "jiraHideIssueSidebar.js"
      ]
    }
  ]
}