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There are weird line/marks above the buttons randomly. (Picture)

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It started happening randomly in Firefox 19 I believe. Also, the Google homepage scrolls vertically, about an inch, and it's annoying. Picture: http://oi36.tinypic.com/2jaxa9.jpg

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hello, please try updating your graphics driver, or in case this doesn't solve the issue or there is no new version available at the moment, disable hardware acceleration in firefox > options > advanced > general.

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Now they appear only when a page is loading and go away only when the page is done loading.

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Did you disable hardware acceleration in Firefox?

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

  • Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.
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I only have two add-ons installed and one plug-in enabled. Disabling all of them does nothing. Running in safe mode fixes the problem. Disabling hardware acceleration was not a good fix. Although it made the lines go away, it made all of the fonts render in low resolution. I didn't add or change any hardware or software when this started happening around Firefox 19.

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Try to set the gfx.content.azure.enabled pref to false or if this didn't help disable Direct2D by setting the gfx.direct2d.disabled pref to true on the about:config page and leave hardware acceleration otherwise enabled.

You can also try to uninstall Windows update KB2670838 if you have this update.

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"Try to set the gfx.content.azure.enabled pref to false"

This did the trick, thanks. But, what is this setting used for?

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Are there any side effects of setting that preference to false?