I found this extension can not override existing HTTP headers. I tested with a 64bit Firefox 55.0 using a blank profile on Windows 7. What a pity! By the way, do you have any plan to support adding annotations for rules?

by Yandong, 2017-08-06

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Add-on safety

Risk impact

Headers Middleman requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Low ******* ****** ** *** ********* ********

Risk likelihood

Headers Middleman has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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