[ALUG] Leetkey

ISTR a workround for adding Leetkey to Thunderbird 17 was sent to the list. Am I dreaming? If my memory is correct I can rootle through everything I have saved from ALUG on the old Eee. If I am wrong, what is the last version in which Leetkey works? If I go onto the Mozilla website and install it, will it replace Mozilla 17, or install another one beside it? -- Tony