Examine source code of Reddit RTL Extension

{
  "manifest_version": 2,
  "name": "Reddit RTL Extension",
  "version": "1.1",
  "description": "Change text direction on Reddit to RTL.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.reddit.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "fonts/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1462e176-f1b7-4c8d-9184-68ff56729670}",
      "strict_min_version": "42.0"
    }
  }
}