By: Marco Benzoni Add-on
Download HTTP alert (current and past versions) for Firefox
Try xHeader →
Latest Version:
1.2.1 Updated:
6 years ago Removed
Ready to install?
HTTP alert is available for download. Be careful when installing it.
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Available versions
You can find the current and older versions of HTTP alert here. You can download the archived versions or inspect their source codes.
As a free user, you can download up to 3 latest versions.
Upgrade to download older versions
| Version | Download | Size | Download count | Timestamp |
|---|---|---|---|---|
| 1.2.1 | XPI · ZIP · Source code | 22.12KB | 0 | 2020-02-26 |
1.2.1 22.12KB
Install XPI file
An XPI file, short for "XPInstall," is a compressed file format used primarily by Mozilla applications, like Firefox and Thunderbird, to distribute and install add-ons or extensions. These files are similar in function to CRX files for Chrome but cater to the Mozilla ecosystem.
- Simply drag-and-drop the XPI into Firefox to install the add-on.
Install ZIP file
- Download the HTTP alert ZIP file.
- In Firefox browser, go to
about:addonsto open Add-ons Manager - Click on ⚙, Install Add-on From File

- Select the HTTP alert ZIP file from step 1. HTTP alert is now installed on your browser.
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