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how do I install lightning1.0b1, I keep getting the message-could not be installed because it is not compatible with Firefox 3.6.10

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I am trying to install lightning 1.0b1, I keep getting the message - lightning 1.0b1 could not be installed because it is not compatible with Firefox 3.6.10

I am trying to install lightning 1.0b1, I keep getting the message - lightning 1.0b1 could not be installed because it is not compatible with Firefox 3.6.10

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The Lightning add-on is for Thunderbird and will not work on Firefox.

If you are trying to install it in Thunderbird see http://kb.mozillazine.org/Extensions_-_Thunderbird