Examine source code of DevSave Adblocker

{
  "name": "Adblocker",
  "version": "1.0",
  "description": "A chrome extension that blocks both ads and trackers",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "icons/logo_128.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{a51ed932-9d01-4d9e-867f-04d666b6c2c9}"
    }
  }
}