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 UTF-8 compliant bangla font (ex., Siyam Rupali) if you already don't have
- In the firefox menu, go to option->option ->content
- Select the tab 'Font & Color'
- Select the Bangla font and save.