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Header Bar 1.0.1-signed.1-signed
Header Bar is a simple toolbar that allows you to add or override request headers.
This add-on has been marked as experimental by its developers
This add-on is not compatible with your version of Firefox because of the following:
About this Add-on
For a more comprehensive suite of header manipulation tools, I recommend Modify Headers. It's a great tool, but it's somewhat cumbersome if all you want to do is set one header.