After I try install the .xpi file on the Moonlight homepage, it prompt "Novell Moonlight could not be installed because it is not compatible with Firefox 5.0". It working fine on Chromium, but I want to use it on Firefox, can you help me please.
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You can try using the Add-On Compatibility Reporter add-on, which disables the version check for add-ons to try out their compatibility with newer versions of Firefox.
The add-on does not solve any of the compatibility problems, it just turns the check for Firefox versions off; if the add-on is indeed incompatible with Firefox 5, then allowing the add-on to run may cause unexpected problems.