I run 32-bit firefox-bin on AMD64 to use 32-bit plugins. Updating from 1.0.7 to 1.5, netscape-flash no longer works properly -- I get sound but no video. There were no problems with 1.0.7. emerge --info Portage 2.0.53_rc7 (default-linux/amd64/2005.1, gcc-3.4.4, glibc-2.3.5-r3, 2.6.14-ck5 x86_64) ================================================================= System uname: 2.6.14-ck5 x86_64 AMD Athlon(tm) 64 Processor 3000+ Gentoo Base System version 1.12.0_pre11 ccache version 2.4 [enabled] dev-lang/python: 2.3.5-r2, 2.4.2 sys-apps/sandbox: 1.2.14 sys-devel/autoconf: 2.13, 2.59-r7 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r1 sys-devel/binutils: 2.16.1 sys-devel/libtool: 1.5.20-r1 virtual/os-headers: 2.6.11-r3 ACCEPT_KEYWORDS="amd64 ~amd64" AUTOCLEAN="yes" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=athlon64 -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb /usr/lib64/mozilla/defaults/pref /usr/share/config /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/texmf/web2c /etc/env.d" CXXFLAGS="-march=athlon64 -O2 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig ccache distlocks sandbox sfperms strict" GENTOO_MIRRORS="http://gentoo.osuosl.org/" LC_ALL="en_US" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/gentopia /usr/local/bmg-main /usr/local/portage" SYNC="rsync://rsync.us.gentoo.org/gentoo-portage" USE="amd64 X aac aalib alsa audiofile avi bash-completion berkdb bitmap-fonts bzip2 cdr crypt cups curl dbus eds emboss encode esd exif expat fam ffmpeg flac foomaticdb fortran gdbm gif glut gnome gpm gstreamer gtk gtk2 hal howl idn imagemagick imlib ipv6 jack java jpeg junit kde lcms ldap libwww lua lzw lzw-tiff mad mikmod mng mono motif mozilla mp3 mpeg ncurses nls nptl ogg openal opengl pam pcre pdflib perl pic png python qt quicktime readline recode ruby samba sdl speex spell sqlite ssl svg tcltk tcpd tetex theora tiff truetype truetype-fonts type1-fonts udev usb userlocales vorbis wmf xine xml2 xmms xpm xv xvid zlib userland_GNU kernel_linux elibc_glibc" Unset: ASFLAGS, CTARGET, LANG, LDFLAGS, LINGUAS, MAKEOPTS
I checked the mozillazine forums and found that the problem is caused by the Adblock extension. Removing it got rid of the problem.
*** Bug 114047 has been marked as a duplicate of this bug. ***
the problem seems not a adblock issue, but flashblock. i've got both installed (yes, i'm paranoid),after disabling both and restarting firefox flash is working again, reenabling both and flash still working, but flashblock is not working anymore. it's not a big issue, i can live without flashblock, but this plugin is way cool. firefox(64)is my primary browser, i only use firefox-bin(32) for flash sites.
*** Bug 120936 has been marked as a duplicate of this bug. ***
It is adblock, namely the old version of it (I know because I don't have flashblock installed). I unpdated adblock and all was well.