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Welcome to Firefox Add-ons.
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About this Add-on
Some key features:
1. Easily add, modify or remove a header for any request on a desired domain(s).
2. For a complete list of HTTP headers, please take a look at the list of HTTP Header Fields in Wikipedia.
3. Clicking on the Toolbar icon allows you to disable or enable the Addon.
4. Each header item has several options to adjust (see Addon's Options page for details)
5. You can add several header items and active or inactive them separately.
6. An example in the options page shows a tutorial on "How to add a custom header".
Note: in order to submit bugs, please visit Addon's Homepage and fill the bug report form.