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Про це розширення
Add, modify or remove a header for any request. https://netmirr.net/ Netmirror Extension Mod Header (HTTP Headers) is an extension that can add, modify or remove an HTTP-request-header for all requests on a website or URL. This Addon is very useful if you are an App developer, website designer, or if you want to test a particular header for a request on a website.
