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try https://addons.mozilla.org/en-US/firefox/addon/8731

this uses google indic transliteration.

Это отзыв для предыдущей версии этого дополнения (0.4.1.1-signed.1-signed). 

Thanks for the information.

While it supports all the Indic languages that are supported by Google Transliteration, it is not supporting various Tamil keyboard layouts.

And also, the phonetic transliteration done by Google is not better for some words: Try 'guha' or 'guhapriya' in Google Tamil transliteration and you will know what I mean ;-)