Some versions of firefox web browser has problem in showing Bangla font properly. It generally occurs after an update of firefox to the next version. Please follow the following steps if you have this problem.

Download Siyum Rupali if you already don't have. When download complete, copy the font. Go to My Computer>Local Disk(C)>Windows>Fonts. Paste there

Follow the steps:
=> In the firefox menu, go to Tools->option ->content

=> Select the tab 'Font & Color' & select Bangla font

=> Click Advance and follow the image and save.


[ P.S. : This tutorial is written in English because you may unable to see the Bangla tutorial. ]