Firefox add-on that lets you change headers and request parameters before they're sent to the server. Unlike proxy request modifiers, it's integrated into the browser, so it has no problem with HTTPS connections, client authentication certificates, or other features that the browser supports.
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The extension is no longer developed since 2010 and it's not compatible with Firefox 57 and later. It still works on XUL-based Firefox forks like Waterfox and Pale Moon