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由 a-aday 发表于 Sept. 8, 2008 · 永久链接

From an earlier review by DerAlb. Works perfectly by the way:

Download the xpi file, rename it to zip, open it. Then open the included file install.rdf and change the maximum version entry for Firefox to 3.0.something.*.
Overwrite the existing version, rename zip to xpi and install. Worked for me!