Examine source code of RSI Reading Mode

{
  "manifest_version": 3,
  "name": "RSI Reading Mode",
  "version": "1.0",
  "description": "Makes the legacy long-form posts on the RSI website more readable. Also estimates the time it would take to read the article.",
  "author": "morbvs@citizen-space.de",
  "icons": {
    "16": "images/logo_invertiert_hochkant_16.png",
    "32": "images/logo_invertiert_hochkant_32.png",
    "48": "images/logo_invertiert_hochkant_48.png",
    "128": "images/logo_invertiert_hochkant_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "images/logo_invertiert_hochkant_16.png",
      "32": "images/logo_invertiert_hochkant_32.png",
      "48": "images/logo_invertiert_hochkant_48.png",
      "128": "images/logo_invertiert_hochkant_128.png"
    }
  },
  "permissions": [
    "scripting",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "rsi_reading_mode@citizen-space.de"
    }
  }
}