Visit any page displaying Google Ads and open the web inspector

  • Ad requests are logged to the console as they are resolved
  • The most useful properties are surfaced at the top level
  • Further details are available in sub-objects labelled “other”

"ad-1": {...},
"ad-2": {...},
"ad-3": {
  prev_iu_szs: "320x50",
  prev_scp: "format=stacked&image=hidden&pos=native",
  us_privacy: "1---",
  cust_params: {
      device_spoor_id: "e644be6d-cd8d-4ca6-9711-78a0b40a51f6",
      guid: "63c4feab-5de0-4eff-8742-f8a07f8e19d7",
      loggedIn: "true",
      permutive: "...",
      other: {...}
  other: {...}


A function called inspectSlots is also made available on the window. Invoking it parses the data-o-ads-* attributes on each slot:

  "name": "article-native",
  "init": "true",
  "targeting": {
    "format": "stacked",
    "image": "hidden",
    "pos": "native"
  "label": "true",
  "formats": {
    "default": ["false"],
    "extra": ["false"],
    "large": ["PartnerContent"],
    "medium": ["PartnerContent"],
    "small": ["PartnerContent"]


  1. Copy the root directory to your machine
  2. Follow these instructions for side-loading the extension (Instructions are for Edge, but similar steps work for Chrome)


  1. Run npm i
  2. Make any desired changes, then run npm run build (a watch mode is coming!)
  3. Apply your updates by clicking the “reload” button in the extension’s settings (you won’t see any changes without doing this)

Screenshot 2022-05-05 at 10 24 25


  • Constrain inspection to pages
  • Tie requests back to the slots that triggered them
  • Support copying parsed values to the clipboard


View Github