MockHeader
From ModHeader
A free, open-source ModHeader replacement
If you are looking for a ModHeader or Mod Header alternative, MockHeader keeps the familiar popup workflow without an account or backend. Import your JSON export and continue editing locally.
How to migrate from ModHeader
- In ModHeader, export the profile as JSON.
- Open MockHeader and choose Import in the profile rail.
- Paste the JSON or choose the exported file, then select Import profiles.
MockHeader converts request and response headers, compatible URL and resource filters, and URL replacements. Browser-specific tab and window IDs are intentionally ignored because they are no longer valid after migration.
Why move to MockHeader?
| Concern | MockHeader |
|---|---|
| Source | Public MIT repository |
| Data | Rules remain in chrome.storage.local |
| Account | Not required |
| Network | No analytics or backend requests |
| Headers | Set, append, or remove request and response headers |
| Workflow | Editable rows, profiles, toggles, filters, and redirects |
ModHeader alternative FAQ
Is MockHeader the official ModHeader?
No. MockHeader is an independent open-source project and is not affiliated with or endorsed by ModHeader.
Can MockHeader import ModHeader JSON profiles?
Yes. Export JSON from ModHeader, then import the file or paste its contents into MockHeader. Compatible headers, filters, and redirects are converted locally.
Is MockHeader free?
Yes. MockHeader is permanently free, MIT licensed, and requires no account or paid plan.
Does MockHeader support request and response headers?
Yes. MockHeader can set, append, or remove HTTP request and response headers using Chrome declarativeNetRequest rules.
Independent project
MockHeader is an independent project and is not affiliated with or endorsed by ModHeader. The name ModHeader is used only to explain profile compatibility and migration.