Leetify already exposes a player's basic stats through its public API, and that is what Pulse reads. Install the extension, open any Steam profile, and a panel appears under the profile header with a Leetify section at the top. Nothing is asked of you first: no account, no login, no API key. The data belongs to Leetify and the section header links straight to that player's full Leetify profile, so the deeper analysis is always one click away. What changes is only where the first look happens.
What the Leetify section shows
Aim rating, K/D, winrate and the number of matches analysed, plus a strip of recent results. Hovering a result opens the detail for that single match. It is the summary you would want before accepting a friend request or queueing with someone, and it sits on the page you were already on.
Two more tiles, reaction time and pre-aim, exist as well. They are off by default and you switch them on in the Pulse options page if you want them.
When the player has never used Leetify
Then there is nothing to show, and the panel says so. It does not fill the tiles with zeroes or estimate anything. Leetify has stats for players who have connected their own account, so an empty section tells you about the account, not about how well the person plays.
What Pulse asks for in return
It is free, it has no account and no login, and it requests a single browser permission,
storage, which is what remembers your settings. Stats are fetched only when you
actually open a profile, never in the background. The
privacy policy covers the rest in detail.
Install it
Grab it for Chrome and other Chromium browsers or for Firefox, then open a Steam profile. There is no setup step after the install.