Headerly

Privacy-first browser extension for setting, appending, or removing HTTP headers via profiles.

Browser extensionfreeglobal

Headerly is a free, ad-free browser extension for creating reusable, precisely targeted profiles that set, append, or remove HTTP request and response headers, or allow/block/redirect requests, built on the browser's native declarativeNetRequest API. It's aimed at developers and power users who need shareable, repeatable header-manipulation setups for testing and debugging rather than one-off devtools overrides.

Website

Full match profile

Behind the summary, Matchbox keeps a richer profile of Headerly - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

Claim Headerly to unlock →

Try Matchbox with your own problem

Describe what is not working - we’ll show you whether Headerly (or something else) actually fits.

Try a problem