Examine source code of LeCheckout Jira

{
  "manifest_version": 3,
  "name": "LeCheckout Jira",
  "version": "1.1.1",
  "author": "@jolution",
  "description": "Generates a branch name from the Jira ticket number and title",
  "host_permissions": [
    "https://*.atlassian.net/*",
    "https://*/browse/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*/browse/*",
        "https://*.atlassian.net/browse/*"
      ],
      "css": [
        "/components/popup/popup.css",
        "/components/content/content.css"
      ],
      "js": [
        "/components/content/inject.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "/components/content/translation.js",
        "/components/config.js",
        "/components/content/language.js",
        "/components/content/inject.js",
        "/components/content/utils.js",
        "/components/content/content.js",
        "/components/content/content.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    },
    "default_title": "LeCheckout for Jira",
    "default_popup": "/components/popup/popup.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png",
    "256": "icons/icon256.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "lecheckout-jira@jolution.de"
    }
  }
}