Examine source code of Numex AdBlock

{
  "manifest_version": 2,
  "name": "Numex AdBlock",
  "version": "0.1.1",
  "description": "Stealthy ad & tracker blocker with cosmetic filtering. Safer defaults (no main_frame blocking).",
  "browser_action": {
    "default_title": "Numex AdBlock",
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/stealth.js",
        "content/cosmetic.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "numex-adblock@knackered.dev",
      "strict_min_version": "91.0"
    }
  }
}