I have solved this issue with the info in the following link.
Open Mozilla Thunderbird Advanced Configuration and reset app.support.baseURL 
value. After resetting I can use characters related alt gr key.
Ref: 
https://getsatisfaction.com/mozilla_messaging/topics/the_key_alt_gr_opens_the_support_page_of_thunderbird_in_firefox_in_gnu_linux_version

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https://bugs.launchpad.net/bugs/961826

Title:
  Pressing AltGR key opens http://support.mozillamessaging.com in
  Message Compose Window under Turkish locale

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