ProperHeaderThe ModHeader alternative you don't have to second-guess
ModHeader was removed from the Chrome Web Store in July 2026. If you relied on it for auth tokens, CORS or feature flags, here's what to look for in a replacement, how ProperHeader compares, and how to move your profiles over in a minute.
What to look for in a replacement
A header extension can see and change every request your browser makes. After the ModHeader removal, the questions worth asking are:
- Can you read the code? Minified or obfuscated code is hard to check. Readable code is easy to check.
- Where can it send data? "We don't collect data" in a privacy policy is a promise. A Content Security Policy that only allows one domain is enforced by Chrome.
- Does it run remote code? Code downloaded after install can change without a store review.
- Does it ask for access to every site up front? Or only the sites you choose?
- Can it import your existing profiles? Rebuilding dozens of rules by hand is how mistakes get made.
How ProperHeader answers those
| ProperHeader | |
|---|---|
| Readable code | ✓ Plain, unminified JavaScript. No build step, no bundler. |
| Analytics / telemetry | ✓ None. The free plan makes no network requests at all. |
| Where it can connect | ✓ Only extensionpay.com (Pro licence check), enforced by the extension's Content Security Policy. |
| Remote code | ✓ None. Everything Chrome runs is in the reviewed package. |
| Site access | ✓ Optional. Nothing applies until you allow a site (or all sites). |
| ModHeader import | ✓ Request/response headers, URL filters, resource types and redirects. Anything that can't convert is listed, never silently dropped. |
| Price | Free forever for request headers and one profile. Pro is $3/month or $36 once. |
ProperHeader vs ModHeader vs Requestly
| ProperHeader | ModHeader | Requestly | |
|---|---|---|---|
| Chrome Web Store | In review (Nov 2026) | Removed 10 July 2026 | Available |
| What it is | A focused header, redirect and file-override extension | A header extension | A broader API platform: API client, mocks and HTTP rules |
| Price | Free, or Pro at $3/month or $36 once | Not installable | Team plans from $10/user/month, billed annually* |
| Best for | Developers who want a small extension they can audit | n/a | Teams that want a full API workspace |
* From requestly.com/pricing on 3 November 2026, which lists Team ($10/user/month) and Team Pro ($15/user/month) billed annually for its API platform; HTTP-rules pricing is listed separately. Check their site for current pricing. Requestly is a good tool if you want a full API workspace for a team. If you want a small, auditable header extension, that's what ProperHeader is for.
Why ProperHeader
Built to be audited
Plain JavaScript you can read in the package, one allowed network destination, and no analytics. The privacy policy lists every request it can make.
A fair price, once
$36 once for lifetime Pro, about the price of a year of a typical subscription. Or $3/month if you'd rather not commit.
Fast to set up
One-click recipes for CORS on localhost, Bearer tokens, stripping CSP, prod JS → localhost and mock API responses.
Manifest V3 native
Built for Chrome's current extension platform from day one, using Chrome's own request engine, so rules are fast and don't need the extension to read pages.
Switch in about a minute
- In ModHeader (if it's still installed), open the profile menu and choose Export.
- Uninstall ModHeader from
chrome://extensions. - Install ProperHeader, open Settings → Import / Export and choose the file (or paste the JSON).
- Check the import summary. Anything that couldn't convert is listed so you can recreate it.
Full walkthrough: import ModHeader profiles into ProperHeader.
Questions
What is the best ModHeader alternative?
It depends on what you need. For a focused, auditable header extension with ModHeader import, ProperHeader. For a full team API platform, Requestly. Whatever you choose, check that you can read its code and see where it sends data.
Can ProperHeader import ModHeader profiles?
Yes. Export from ModHeader, then use Settings → Import / Export → Import in ProperHeader. Headers, filters, resource types and redirects convert automatically, and anything that can't is listed.
Is ProperHeader free?
Yes. The free plan includes one profile, unlimited request headers, import/export and the pause switch, and it makes no network requests. Pro ($3/month or $36 once) adds response headers, filters, redirects, overrides and unlimited profiles.
Is ProperHeader affiliated with ModHeader?
No. ProperHeader is an independent project and isn't affiliated with or endorsed by ModHeader.