Greys bars displayed with scrolling

Discussion in 'Mac Basics and Help' started by microdog, Jul 16, 2015.

  1. microdog macrumors newbie

    Jul 16, 2015
    Hi everyone,

    I'm from France and I come here because I have a very strange issue since a few days.

    With Firefox, when I scroll, I see these strange grey bars :


    When I go lower to quit the screen zone when to problem appears and I come back to it, everything is back to normal.. Sometime, it's even parts of the page (pieces of pictures and texts) which are retain on the screen.. I sroll down and I scroll up again, and nothing is left, everything is normal.

    I observe this phenomenon only with Firefox and Twitter. Everything seems to be okay with other browsers (Chrome, Opera, Safari..).

    I try to deactivate all the addons, to re-initialise Firefox.. same problem.

    I don't think it's an hardware issue, isn't it ?

    Configuration :

    OS X 10.10.4

    iMac 27" late 2013 (bought december 2014)
    CPU : 3.5 GHz Intel Core i7
    RAM : 32 Go 1600 MHz DDR3
    GPU : Nvidia GeForce GTX 780M 4096 Mo

    Firefox 39.0

    All the updates are done via App Store.

    Any ideas of the nature of the problem ?

    Thanks for your help.

  2. microdog thread starter macrumors newbie

    Jul 16, 2015
    Hello everyone,

    I have an iMac 27" late 2013 (bought in December 2014). Since a few days, I noticed graphic bugs.

    Like this but only with Firefox on Twitter :


    And I got something like this twice since yesterday :


    Is a software issue ? I hope that it's not hardware. I never got issues like this before. Maybe it's related to my 10.10.3 to 10.10.4 update ?

    I ran Apple Diagnostics (D key on boot) and everything seems to be okay.

    Thanks for your help.


  3. balamw Moderator


    Staff Member

    Aug 16, 2005
    New England
    Since you only see it with Firefox, that would be my first suspect.


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