addon-sdk-1.0b1/python-lib/cuddlefish/app-extension/install.rdf が原因 <em:targetApplication> <Description> <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id> <em:minVersion>4.0b7</em:minVersion> <em:maxVersion>4.0b*</em:maxVersion> </Description> </em:targetApplication> こんな風に書き換えれば…