Examine source code of TextCompanion

{
  "developer": {
    "name": "Jan Riechers",
    "url": "https://www.dwrox.net"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f97c8b21-34c7-4977-8e60-df16d1869e5b}",
      "strict_min_version": "109.0"
    }
  },
  "description": "Provides a optional overlay, and context menu for browser text selections and quickly open links in background.",
  "homepage_url": "https://github.com/jrie/textcompanion",
  "manifest_version": 3,
  "name": "TextCompanion",
  "version": "0.2.3",
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "options_ui": {
    "page": "page_settings.html",
    "browser_style": false
  },
  "icons": {
    "16": "icons/tc_16x16.png",
    "48": "icons/tc_48x48.png",
    "64": "icons/tc_64x64.png",
    "128": "icons/tc_128x128.png"
  },
  "background": {
    "scripts": [
      "textcompanion_bg.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "textcompanion.js"
      ],
      "css": [
        "textcompanion.css"
      ],
      "run_at": "document_idle"
    }
  ]
}