Site Stats от Sean

Site Stats shows what the page you're on actually loaded, and lets you do something about the cookies it set.

Toolbar popup
- Bytes transferred, load time, network requests, domains contacted, requests blocked by tracking protection, and cookies
- Every domain the page contacted, labeled first or third party, with Firefox's tracker category (advertising, analytics, social, fingerprinting...)
- Every cookie the page's domains can read, including partitioned third-party cookies. Delete one, a domain's, or all of them
- Block cookies from a domain, everywhere

Detailed report (click Details...)
- Page-load waterfall: DNS, connect, TLS, waiting for the server, download, building the page, plus first and largest contentful paint
- Connection security: TLS version, cipher, certificate issuer and expiry, HSTS, mixed content
- Requests and bytes by type, every request (filterable and sortable), every cookie
- Links to learn more (MDN, Mozilla Support), and to check the site with Mozilla HTTP Observatory, SSL Labs, PageSpeed Insights, Blacklight, or WHOIS
- Save the report as JSON

It understands single-page apps and service workers, and tells apart requests blocked by tracking protection, by a DNS filter, or by another add-on.

Privacy: Site Stats collects nothing and sends nothing anywhere. It makes no network requests of its own. Statistics stay in memory and disappear when the tab closes. The external links in the report are only followed when you click them.

Open source (MPL-2.0): https://github.com/seanmnaes/site-stats