Header Override EN
Massimiliano · Firefox
Modify HTTP request headers, ModHeader-style (Chrome MV3 / declarativeNetRequest)
截图
简介
Header Override is a developer-focused browser extension that lets you modify outgoing HTTP request headers without leaving the browser. Define profiles of header rules, toggle them on and off, and target specific URLs with glob or regex patterns.
Designed for developers and QA engineers who:
• Test APIs with multiple Bearer tokens for different roles, environments, or users
• Inject custom headers into Swagger UI, OpenAPI explorers, or any browser-based tool
• Bypass simple authentication during local development
• Switch between dev / staging / prod environments without juggling browser profiles
Key features:
• Profiles with independent on/off toggle and color badge
• Per-rule operations: set, append, or remove a header
• URL conditions — glob (://.example.com/*) or regex (/^https:\/\/api./) at profile and rule level
• Multi-preset rules — keep N values for the same header (e.g. SUPERVISOR / OPERATOR tokens) and switch via dropdown
• Per-tab override — lock a profile to a single browser tab
• JWT decoder + editor — click the dot next to an Authorization Bearer token to decode header/payload, see expiry status, edit and re-encode JSON
• ModHeader v2 JSON import/export — full round-trip, with auto-collapse of duplicate-header rules into presets
• Paste cURL — drop a curl command, get a profile with all its headers in one click
• Test URL sandbox — type a URL, see which rules match, optionally fire a real fetch
• Recent matches Activity log
• Light / dark / auto theme (follows OS preference)
• Hotkeys — Ctrl+Shift+H toggles all overrides, Ctrl+Shift+U opens the popup
Privacy: all data is stored locally. The extension does not collect, transmit, or share any user data.
Privacy policy: https://github.com/reservation-extension/privacy-header-override/blob/main/PRIVACY.md
Header Override 是做什么的
Header Override 是一款面向 Firefox 的开发者工具类扩展,主要用来调试页面、查看样式与请求、测试接口、辅助前端开发。官方对它的介绍是:Modify HTTP request headers, ModHeader-style (Chrome MV3 / declarativeNetRequest)在Firefox 附加组件商店(AMO)上,它当前版本 0.2.6,约 45 名用户。
适合什么人用
从功能定位看,Header Override 更适合前端工程师、测试与需要经常查看页面结构的用户。如果你平时只是偶尔遇到相关需求,用浏览器自带功能也能凑合;但如果这件事每天都发生,装一个专门处理它的扩展通常比手动操作省事得多。
怎么安装 Header Override
- 打开Firefox 附加组件商店(AMO)上的官方页面;
- 点「添加到浏览器」并确认权限提示;
- 装好后在扩展列表里固定图标,方便随时开关。
本站只做索引与介绍,安装包来自官方商店。如果商店页面提示当前地区不可用,说明该扩展未在你所在区域上架。
常见问题
Header Override 是免费的吗?
Header Override 在Firefox 附加组件商店(AMO)免费提供下载。它是浏览器扩展,装上就能直接用,不需要注册账号。
Header Override 安全吗?
它只申请了 0 项权限,范围比较克制,没有申请「读取所有网站数据」这种大权限。
Header Override 支持哪些浏览器?
当前收录的版本来自Firefox 附加组件商店(AMO),适用于 Firefox。同一个扩展在其他商店可能有对应版本,但功能与版本号不一定相同。
怎么卸载 Header Override?
在扩展管理页找到 Header Override,点移除即可。它在本地保存的设置会一起清掉,不会残留数据。
权限清单 来自 manifest.json 原文
接口权限 3
storagewebRequestwebRequestBlocking




