Many users are complaining on the forum and our Facebook Page about Bengali not showing up properly after upgrading Firefox. This is a bug in Firefox and here’s how you can fix it.
First step I recommend : Install at least one Bengali / Bangla Unicode font.
Download the Bengali font from here : http://www.omicronlab.com/bangla-fonts.html
Go to Firefox Options > Content > Fonts & Colors > Click on Advanced
Under Fonts for > Select Bengali from dropdown list select Siyam Rupali or any other good Bengali font.
You will get another solution here
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