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Firesheep And BlackSheep On Firefox 4.0+

ID: 115e78e7-0b7a-569b-9296-d1e043cd93b9

STIX ID: report--115e78e7-0b7a-569b-9296-d1e043cd93b9

Feed Name: Zscaler Security Research Blog

Date Published: 2025-04-02

Date Updated: 2026-05-01

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Firesheep compatibility update: Firefox 4/Gecko2 introduced asynchronous add-on manager APIs and new XPCOM interfaces that broke Firesheep's original architecture. The project removed its custom C++ XPCOM backend, switched to using native Firefox process execution with temporary-file output, and produced a firefox5 branch that compiles on Linux but not on Windows (missing build dependencies), so no binary release is available; the BlackSheep derivative is impacted as well and the author requests a Windows-built binary.

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