Examine source code of Jira Diff Highlighter

{
  "manifest_version": 3,
  "name": "Jira Diff Highlighter",
  "version": "2.0",
  "description": "Improves readability of Jira ticket diffs.",
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "scripting"
  ],
  "host_permissions": [
    "https://*.atlassian.net/*"
  ],
  "optional_host_permissions": [
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.atlassian.net/*"
      ],
      "js": [
        "lib/diff_match_patch.js",
        "content/content.js"
      ],
      "css": [
        "content/styles.css"
      ]
    }
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jira-diff-highlighter@example.com",
      "strict_min_version": "128.0"
    }
  }
}