Prothom-alo on Ubuntu/Debian

apt-get install language-support-fonts-bn ttf-bengali-fonts ttf-indic-fonts-core

now, install the Prothom-alo fonts:

• http://www.prothom-alo.com/fonts/download/bngsalpn.ttf

• http://www.prothom-alo.com/fonts/download/prothoma.ttf

Restart firefox && enjoy ;)