User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 A white vertical stripe appears to the right of the central image after (slowly) resizing the Firefox window. It doesn't happen to any size. Why do I think it is a bug? Because it doesn't happen to other browsers (Chrome, IE 8, Opera). Reproducible: Sometimes

Mozilla/5.0 (Windows NT 6.1; rv:2.0b13pre) Gecko/20110316 Firefox/4.0b13pre Confirmed. Slowly resizing the firefox window displays a white vertical strip on the right side of the page. Able to reproduce in 3.6.16pre version also.

I confirm this with Firefox 25.0.1 on my Gentoo box emerge --info firefox Portage 2.2.7 (default/linux/amd64/13.0, gcc-4.8.2, glibc-2.16.0, 3.12.1-gentoo x86_64) ================================================================= System Settings ================================================================= System uname: Linux-3.12.1-gentoo-x86_64-Intel-R-_Core-TM-_i5-2400_CPU_@_3.10GHz-with-gentoo-2.2 KiB Mem: 16391772 total, 1535464 free KiB Swap: 2095100 total, 2085128 free Timestamp of tree: Fri, 29 Nov 2013 14:45:01 +0000 ld GNU ld (GNU Binutils) 2.23.1 app-shells/bash: 4.2_p45 dev-java/java-config: 2.2.0 dev-lang/python: 2.7.5-r3, 3.2.5-r3 dev-util/cmake: 2.8.11.2 dev-util/pkgconfig: 0.28 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.12.4 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.11.6, 1.12.6, 1.13.4 sys-devel/binutils: 2.23.1 sys-devel/gcc: 4.6.4, 4.7.3-r1, 4.8.2 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4.2 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.9 (virtual/os-headers) sys-libs/glibc: 2.16.0 Repositories: gentoo vortex gamerlay systemd gnome-next ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O3 -march=native -pipe -fomit-frame-pointer" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt /var/lib/hsqldb" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.4/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O3 -march=native -pipe -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fail-clean fixlafiles merge-sync news parallel-fetch parallel-install preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync webrsync-gpg xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="ftp://mirror.corbina.net/gentoo" LANG="ru_RU.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j5" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage/vortex /var/lib/layman/gamerlay /var/lib/layman/systemd /var/lib/layman/gnome-next" SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage" USE="7zip X a-like-o a52 aac aacplus aalib acl acpi alsa amd64 apng applet archive artworkextra audacious audio audiofile automount avx bazaar berkdb bittorrent bittorrent-external branding bsf bzip2 cairo caps chardet chdir cjk cli collada cover cracklib crypt css cuda cue cupsddk curl custom-optimization cvs cxx dbus dconf device-mapper dga dhcp dht diff dirac directfb disk-partition divx djvu dnsretry dos drawing dri dv eap-tls enca encode exif experimental extensions extras facedetect fat fbcondecor ffmpeg fftw fileinfo firefox flac fontconfig fortran frei0r fts3 fuse g3dvl gd gdbm gdm geoip gif glade gles2 glib glitz gnome gnome-keyring gphoto2 gpm graphite grp grub gstreamer gtk gtk3 gtkstyle gudev gzip hddtemp histman hog hvm hwdb iconsets iconv icq id3tag idle idn infinality inifile intl introspection ioemu ipv6 jabber java javascript jingle joystick jpeg jpeg2k kate keymap kinetic kvm ladspa lame lcms libass libcaca libkms libnotify libsamplerate libtiger lights lm_sensors loop-aes lucene lyrics lzma lzo mad matroska melt mercurial minizip mmx mmxext mng modules mp2 mp3 mp4 mp4live mpeg mpeg2 mpg123 mplayer mpris mpu401 mtp mudflap multilib multimedia musepack mvl mysql mysqli nautilus ncurses netplay network networkmanager nls nptl nsplugin nss ntfs ntfsprogs nvidia offensive ofx ogg ogm oodict openal opencore-amr opengl openmp openssl opensslcrypt optimization optimized-qmake oscar pam parse-clocks pcf pch pcre pcre16 pdf pdo pgo php player plugins png policykit ppds pppd projectm psf pulseaudio purple qml qpak quicktime rar readline realmedia realtime reiserfs resolvconf romio rtsp ru-dv ru-g ru-i ru-k sasl scale0tilt screen screenshot sdl secure-delete session skins slp smp sndfile sound sounds speex spell sqlite sqlite3 sse sse2 sse2_4way sse3 sse4 ssl ssse3 stream strong-optimization subtitles subversion svg system-cairo system-icu system-jpeg system-sqlite systemd t1lib taglib tcpd textures theora threads thunderbird tiff timidity tint2conf tk tls toolbar trayicon truetype tta tweak-mode twolame udev udisks unicode unzip usb utils v4l2 vaapi vala vamp vdpau verse vkontakte vorbis vorbis-psy vpx wad wav wavpack webkit whiteboarding winbind wma wmp x264 xanim xattr xcb xcomposite xhtml xinetd xml xmlreader xmlrpc xmlwriter xorg xosd xpm xsl xulrunner xv xvfb xvid zip zlib" ABI_X86="32 64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CURL_SSL="nss" DRACUT_MODULES="plymouth systemd" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="pc efi-64" INPUT_DEVICES="evdev joystick" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="ru ru_RU en" NETBEANS_MODULES="apisupport harness ide java nb websvccommon php" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-4" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" RUBY_TARGETS="ruby19 ruby18" USERLAND="GNU" VIDEO_CARDS="nvidia" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON ================================================================= Package Settings ================================================================= www-client/firefox-25.0.1 was built with the following: USE="alsa custom-optimization dbus gstreamer jit libnotify minimal (multilib) pulseaudio system-cairo system-icu system-jpeg system-sqlite -bindist -custom-cflags -debug (-pgo) (-selinux) -startup-notification -wifi" ABI_X86="64" LINGUAS="ru -af -ak -ar -as -ast -be -bg -bn_BD -bn_IN -br -bs -ca -cs -csb -cy -da -de -el -en_GB -en_ZA -eo -es_AR -es_CL -es_ES -es_MX -et -eu -fa -fi -fr -fy_NL -ga_IE -gd -gl -gu_IN -he -hi_IN -hr -hu -hy_AM -id -is -it -ja -kk -km -kn -ko -ku -lg -lt -lv -mai -mk -ml -mr -nb_NO -nl -nn_NO -nso -or -pa_IN -pl -pt_BR -pt_PT -rm -ro -si -sk -sl -son -sq -sr -sv_SE -ta -ta_LK -te -th -tr -uk -vi -zh_CN -zh_TW -zu" CFLAGS="-march=native -pipe -mno-avx" CXXFLAGS="-march=native -pipe -mno-avx"

This is bug example from Youtube

And this is how Opera renders Youtube images

Slow resize result of Mihai's image

> I confirm this with Firefox 25.0.1 on my Gentoo box Same here when i build FF31 with '-O3' on openSUSE. '-O2'-build seems fine with both bundled and system libpng. But i don't think that our complete visual png breakdown is part of the original report, it's much worse. The only relevant things that i've found about it are: https://bugzilla.mozilla.org/show_bug.cgi?id=8518 http://www.libpng.org/pub/png/pngmoz.html(In reply to nE0sIghT from comment #3)