Bug with Firefox

[ghost]

Hello ! Firstly, I'd like to thank you for this amazing project !
And secondly, there is some bugs with Firefox. When I try the "official" demo, there is some pixels of ancient slides that stays displayed even in other slides. Sorry, I'm not clear, I don't speak english very well, so, here's a screenshot of what I see when I try your demo : https://imgur.com/JZ0UoM8 (I'm running Firefox 34 on Ubuntu 14.04)
Is there a rationnal explanation for that ?

[ghost]

And I must add that when I go in an other tab in Firefox, and after that, I re-come to the impress.js tab, everything is clean, and there is no trace of the bug...

[FagnerMartinsBrack]

This is a known and reported bug at Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1098266

[FagnerMartinsBrack]

For now you could do this:

if ( navigator.userAgent.indexOf( "Firefox/34.0" ) !== -1 ) {
    $( "body" )
        .removeClass( "impress-supported" )
        .addClass( "impress-not-supported" );
}

[ghost]

Oh, sorry ! I didn't think to search an answer in the Mozilla tracker...
So, it's a bug of Firefox itself...
Thank you very much !