No character is visible on screen while using mozilla firefox browser

upto last sunday I was able to browse net using Mozilla firefox. But from yesterday no characters are visible.

You can try to disable OMTC and leave hardware acceleration in Firefox enabled.
*<b>about:config</b> page: <b>layers.offmainthreadcomposition.enabled</b> = false
*http://kb.mozillazine.org/about:config
You can try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
You need to close and restart Firefox after toggling this setting.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

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