Black artifacts when resizing browser window

The latest update of Firefox (39) Watch black artifacts on the toolbar and when window resizing the browser window. They disappear when I resize the window or scroll.

The uploader of the image on this page doesn't seem to work, gets stuck on uploading... so here's the link to the image https://drive.google.com/open?id=0B9GV3PS3m5ioQjhjZGRuX0w4czQ

  • Hardware Acceleration (disabled)
  • I did a clean install and restored my previous profile (number still present)

Since the zoom, which forces a repaint, corrects the display at least temporarily, you can try to disable OMTC, a feature introduced in Firefox 33. Here's how:

(1) in a new tab, type or paste Subject: config in the address bar and press ENTER. Click on the button promising to be careful.

(2) in the search above the list box, type or paste the layers and make a pause so that the list is filtered

(3) double-click the preference layers.offmainthreadcomposition.enabled to true to false

Any difference?

Note: I read in a bug report at the time that this change causes problems with the YouTube HTML5 player, if hardware acceleration is disabled, then you may also force the Flash on YouTube if you keep this setting. You can use an add-on for this: https://addons.mozilla.org/firefox/addon/youtube-flash-video-player/

Tags: Firefox

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