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I tried to install it but it keeps report that it cannot be installed on FireFox 14.0.1. Please update this add on.

Это отзыв для предыдущей версии этого дополнения (1.1.5.1-signed.1-signed). 

Hmm... I just double-checked installing and running in Firefox 14.0.1 and it all works fine for me. It could possibly be the version of OS X you are running (it works on 10.6, probably works on 10.5, but definitely won't work on 10.4).

Please report a bug in the issue tracker with the exact install process you are following, the exact error message you are receiving, and any other relevant details. If I can reproduce your problem, I'll try to fix it.