Auto-dimming LCD and stripes

The unit is a X121e with 64-bit original preinstalled windows 7.
Stripes are appearing when moving cursor in Firefox and " Thunderbird. As both are Mozilla products, maybe it is a developer dependent problem. Restart didn't help. Just asking whether anyone encountered something like this.
Second problem: Screen got totally (and auto) dimmed when bringing Google chrome or firefox in foreground. Restart did help, but want to know if I missed anything. Same question here: did anyone have this kind of problem?
Thanks

I would like to share with you that it might be because of software issue.
To diagnose, I would suggest you to please update the graphics driver and also update the Bios of your Notebook from the below mentioned web link.
http://support.lenovo.com/en_US/downloads/default.page?
After this, please restart the Notebook and check if the issue resolved.
Regards,
Sameer
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