Header Kit

Modify headers, cookies, query parameters, and redirects with profiles, URL Match, variables, import, and export.

Modify HTTP request headers and URL query parameters on any site — with clean, reusable profiles. This lightweight extension lets you inject custom request headers and query parameters into web pages that match a URL pattern you define. It's built for developers, QA engineers, and API testers who constantly need to send an auth token, a request ID, a debug flag, or an environment switch — without editing code or fiddling with a proxy. ━━━━━━━━━━━━━━━━━━━━ KEY FEATURES ━━━━━━━━━━━━━━━━━━━━ • Request headers — Add or override any HTTP request header (e.g. x-request-id, x-token) per profile. Toggle each header on or off individually. • Query parameters — Automatically append parameters (e.g. isDebug=1) to pages that match your rules. • URL Match filters — Scope each profile to a specific domain or path, or leave it as “*” to apply everywhere. Rules only run where you want them. • Reusable variables — Define a variable once (e.g. env = gray) and reference it across headers and parameters with {{ }}. Change it in one place, update everything. • Profiles — Organize your setups into separate profiles, each with its own badge color, and switch them on or off with a single click. • Compact & full views — Work quickly from the popup, or open the full-window layout to manage headers, queries, filters, and variables side by side. • Import & Export — Back up your profiles or move them between machines. • Made yours — Light / dark mode, three accent themes, and per-profile badge colors. ━━━━━━━━━━━━━━━━━━━━ PRIVACY FIRST ━━━━━━━━━━━━━━━━━━━━ Everything you configure is stored locally on your device. This extension does not collect your data, does not track your browsing, does not read page contents, and has no external server. Your headers, tokens, and parameters never leave your browser. ━━━━━━━━━━━━━━━━━━━━ PERMISSIONS ━━━━━━━━━━━━━━━━━━━━ • declarativeNetRequest — to apply your header rules to matching requests. • storage — to save your profiles locally. • host access — to apply your rules on the sites you choose. Questions or feedback? Contact us at gaoyiniy@126.com.