Mozilla Firefox Settings

Firefox setting:

Go to

Tools >> Options >> Content Tab

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Click on Advanced

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In Fonts for dropdown, select Bengali
In Proportional Select, Sans Serif and do the following and again select Serif and do the following:
Put Size as 16 or 17.
Serif, from dropdown select SolaimanLipi
Sans Serif --- SolaimanLipi.
OK and OK
These selection assumes that SolaimanLipi is already installed.