Package: firefox-esr
Version: 91.4.1esr-1~deb11u1
Severity: important
File: /usr/bin/firefox
X-Debbugs-Cc: t...@security.debian.org

Dear Maintainer,
after upgrading firefox-esr from 78.15.0esr-1 to 91.4.1esr-1, it can't open
any web page. The tab crashes immediately, with errors like this in dmesg:
traps: Web Content[2691] trap invalid opcode ip:ad209c0d sp:bf87369c error:0 in 
libxul.so[ac17e000+5844000]

This is a P3 CPU so I guess that SSE2 instructions sneaked in again and this
CPU cannot handle them:
$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 11
model name      : Intel(R) Celeron(TM) CPU                1100MHz
stepping        : 1
microcode       : 0x1c
cpu MHz         : 1364.963
cache size      : 256 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
apicid          : 0
initial apicid  : 0
fdiv_bug        : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov 
pse36 mmx fxsr sse cpuid
bugs            : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds 
swapgs itlb_multihit
bogomips        : 2729.92
clflush size    : 32
cache_alignment : 32
address sizes   : 36 bits physical, 32 bits virtual
power management:

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
   * What was the outcome of this action?
   * What outcome did you expect instead?

*** End of the template - remove these template lines ***


-- Package-specific info:

-- Extensions information
Name: Amazon.com
Location: /usr/lib/firefox-esr/browser/omni.ja
Package: firefox-esr
Status: enabled

Name: Bing
Location: /usr/lib/firefox-esr/browser/omni.ja
Package: firefox-esr
Status: enabled

Name: Dark theme
Location: /usr/lib/firefox-esr/browser/omni.ja
Package: firefox-esr
Status: user-disabled

Name: DoH Roll-Out
Location: /usr/lib/firefox-esr/browser/features/doh-roll...@mozilla.org.xpi
Package: firefox-esr
Status: enabled

Name: DuckDuckGo
Location: /usr/lib/firefox-esr/browser/omni.ja
Package: firefox-esr
Status: enabled

Name: Firefox Alpenglow theme
Location: /usr/lib/firefox-esr/browser/omni.ja
Package: firefox-esr
Status: user-disabled

Name: Firefox Screenshots
Location: /usr/lib/firefox-esr/browser/features/screensh...@mozilla.org.xpi
Package: firefox-esr
Status: enabled

Name: Form Autofill
Location: /usr/lib/firefox-esr/browser/features/formautof...@mozilla.org.xpi
Package: firefox-esr
Status: enabled

Name: Google
Location: /usr/lib/firefox-esr/browser/omni.ja
Package: firefox-esr
Status: enabled

Name: Light theme
Location: /usr/lib/firefox-esr/browser/omni.ja
Package: firefox-esr
Status: user-disabled

Name: Picture-In-Picture
Location: /usr/lib/firefox-esr/browser/features/pictureinpict...@mozilla.org.xpi
Package: firefox-esr
Status: enabled

Name: Proxy Failover
Location: 
/home/rainbow/.mozilla/firefox/7e8psv5p.default/features/{037a4322-a290-423b-8727-7d7e3091e40c}/proxy-failo...@mozilla.com.xpi
Status: enabled

Name: System theme theme
Location: /usr/lib/firefox-esr/omni.ja
Package: firefox-esr
Status: enabled

Name: Web Compatibility Interventions
Location: /usr/lib/firefox-esr/browser/features/webcom...@mozilla.org.xpi
Package: firefox-esr
Status: enabled

Name: WebCompat Reporter
Location: 
/usr/lib/firefox-esr/browser/features/webcompat-repor...@mozilla.org.xpi
Package: firefox-esr
Status: user-disabled

Name: Wikipedia (en)
Location: /usr/lib/firefox-esr/browser/omni.ja
Package: firefox-esr
Status: enabled


-- Addons package information
ii  firefox-esr    91.4.1esr-1~deb11u1 i386         Mozilla Firefox web browser 
- Extended Support Release (ESR)

-- System Information:
Debian Release: 11.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 5.10.0-10-686 (SMP w/1 CPU thread)
Kernel taint flags: TAINT_WARN
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_US:en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages firefox-esr depends on:
ii  debianutils          4.11.2
ii  fontconfig           2.13.1-4.2
ii  libatk1.0-0          2.36.0-2
ii  libc6                2.31-13+deb11u2
ii  libcairo-gobject2    1.16.0-5
ii  libcairo2            1.16.0-5
ii  libdbus-1-3          1.12.20-2
ii  libdbus-glib-1-2     0.110-6
ii  libevent-2.1-7       2.1.12-stable-1
ii  libffi7              3.3-6
ii  libfontconfig1       2.13.1-4.2
ii  libfreetype6         2.10.4+dfsg-1
ii  libgcc-s1            10.2.1-6
ii  libgdk-pixbuf-2.0-0  2.42.2+dfsg-1
ii  libglib2.0-0         2.66.8-1
ii  libgtk-3-0           3.24.24-4
ii  libpango-1.0-0       1.46.2-3
ii  libstdc++6           10.2.1-6
ii  libvpx6              1.9.0-1
ii  libx11-6             2:1.7.2-1
ii  libx11-xcb1          2:1.7.2-1
ii  libxcb-shm0          1.14-3
ii  libxcb1              1.14-3
ii  libxcomposite1       1:0.4.5-1
ii  libxdamage1          1:1.1.5-2
ii  libxext6             2:1.3.3-1.1
ii  libxfixes3           1:5.0.3-2
ii  libxrender1          1:0.9.10-1
ii  procps               2:3.3.17-5
ii  zlib1g               1:1.2.11.dfsg-2

Versions of packages firefox-esr recommends:
ii  libavcodec58  7:4.3.3-0+deb11u1

Versions of packages firefox-esr suggests:
pn  fonts-lmodern          <none>
pn  fonts-stix | otf-stix  <none>
pn  libcanberra0           <none>
ii  libgssapi-krb5-2       1.18.3-6+deb11u1
pn  pulseaudio             <none>

-- no debconf information

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