I am using Firefox Setup 16.0b2 when I install avrokeyboard_5.1.0 Then I can't see Bangla font now I am suffering an unwanted problem please help me so that I will see Bangla font easily.
Does avrokeyboard_5.1.0 install an extension in Firefox?
Do you have that problem with the current release version - Firefox 15.0.1?
Try to set the Boolean pref gfx.font_rendering.directwrite.use_gdi_table_loading to false on the about:config page.
Try to disable hardware acceleration in Firefox.