Dosson
A Chrome extension that inspects the page you're on, from a keyboard-driven overlay that looks like DOS. Tap Esc Esc on any page to open it.
Coming soon to the Chrome Web Store
Try it
Tap Esc Esc to show Dosson
This is a demo of the latest Dosson, running on this page as the extension does.
Use → and ← to navigate: open and close menus. ↑ ↓ move, ? explains every row.
When the extension is installed, Esc Esc shows and hides it on any page.
What it shows
Performance
The page's Core Web Vitals as they happen, what it downloaded by kind (JavaScript, CSS, images, fonts, API calls), how many DOM nodes and CSS rules it has, and the device's memory and cores.
Inspect
The global variables and functions the page added to window, in the page and in its iframes, including cross-origin ones. Open any object, call a function with your own arguments, or change a value.
Frameworks
The JavaScript and CSS frameworks the page uses, with their versions: 191 JavaScript and 141 CSS detectors, each one tested against the real library. Each shows when that version came out and what the latest is.
Security
Credentials any script on the page could read: API keys and tokens in globals, localStorage, sessionStorage and readable cookies, in every frame. Values are shown redacted until you ask for them.
Keys
- Esc Esc
- Show or hide Dosson (or click its toolbar icon). Settings can change the key.
- ↑ ↓
- Move through a menu.
- → Enter
- Open the selected row.
- ← Esc
- Close the menu or panel.
- ?
- Explain every row in the menu.
- x
- Download the menu as JSON.
Private by design
There is no Dosson server and no analytics. Everything is read and computed in your browser. Read the privacy policy.