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由 Mark Hill 发表于 Aug. 4, 2009 · 永久链接

(Thanks for the ctrl+drag tip! This may become unnecessary if I can retrain myself.)

To make Duplicate install in Firefox 3.5:
- download the .xpi, rename it as .zip
- edit the install.rdf file so is something like 3.6.
- Replace the install.rdf file with your edited copy
- rename the .zip file back to .xpi
- drag the .xpi into an open Firefox window.

It worked for me in both Linux and Windows.