Examine source code of Costlocker Tracking Button

{
  "applications": {
    "gecko": {
      "id": "costlocker-button@costlocker.com",
      "strict_min_version": "50.0"
    }
  },
  "name": "Costlocker Tracking Button",
  "description": "Track time from any web tool (Trello, JIRA, Google Calendar etc.)",
  "short_name": "Costlocker Button",
  "version": "2024.4.12",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "src/popup.html",
    "default_icon": {
      "16": "assets/icons/inactive-16x16.png",
      "32": "assets/icons/inactive-32x32.png",
      "48": "assets/icons/inactive-48x48.png",
      "128": "assets/icons/inactive-128x128.png"
    }
  },
  "options_ui": {
    "page": "src/options.html"
  },
  "background": {
    "scripts": [
      "src/api.js"
    ]
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+T",
        "mac": "MacCtrl+Shift+T"
      },
      "description": "Opens hello.html"
    }
  },
  "icons": {
    "16": "assets/icons/inactive-16x16.png",
    "32": "assets/icons/inactive-32x32.png",
    "48": "assets/icons/inactive-48x48.png",
    "128": "assets/icons/inactive-128x128.png"
  },
  "incognito": "spanning",
  "permissions": [
    "activeTab",
    "storage",
    "cookies",
    "https://extensions.app.costlocker.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://trello.com/*"
      ],
      "js": [
        "providers/trello.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://calendar.google.com/*"
      ],
      "js": [
        "providers/google-calendar.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.atlassian.com/*",
        "*://*.atlassian.net/*"
      ],
      "js": [
        "providers/jira.js"
      ],
      "run_at": "document_idle"
    }
  ]
}