Changing points from version 0.9 are as follows:
Fixed issue: more than one options dialog is open.
Fixed issue: error occur when options dialog is closed after message window was closed.
Fixed issue: having probability of error occurring when HTML message body is displayed by plain text style.

Fixed issue: processing IDN(Internationalized Domain Name) with Thunderbird 3 or later.
Included locales are en-US and ja.