All my chrome-offshoot browsers hang

[joneall]

Firefox is my principal and default browser, but sometimes I want another. Usually that is chromium, but with its problems, I have also tried google-chrome, opera and vivaldi. They all hang -- and Vivaldi displays a screen-filling gray screen ("made in Europe" which can only be stopped with sudo kill -9 pid. I tried them all by command line and here are the results.

chromium:

update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/local/share/doc /usr/local/share/doc none bind,ro 0 0): cannot writ
e to "/var/lib/snapd/hostfs/usr/local/share/doc" because it would affect the host in "/var/lib/snapd"
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/gimp/2.0/help /usr/share/gimp/2.0/help none bind,ro 0 0): can
not write to "/var/lib/snapd/hostfs/usr/share/gimp/2.0/help" because it would affect the host in "/var/lib/snapd"
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/gtk-doc /usr/share/gtk-doc none bind,ro 0 0): cannot write to
"/var/lib/snapd/hostfs/usr/share/gtk-doc" because it would affect the host in "/var/lib/snapd"
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/libreoffice/help /usr/share/libreoffice/help none bind,ro 0 0
): cannot write to "/var/lib/snapd/hostfs/usr/share/libreoffice/help" because it would affect the host in "/var/lib/snapd"
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/sphinx_rtd_theme /usr/share/sphinx_rtd_theme none bind,ro 0 0
): cannot write to "/var/lib/snapd/hostfs/usr/share/sphinx_rtd_theme" because it would affect the host in "/var/lib/snapd"
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/xubuntu-docs /usr/share/xubuntu-docs none bind,ro 0 0): canno
t write to "/var/lib/snapd/hostfs/usr/share/xubuntu-docs" because it would affect the host in "/var/lib/snapd"
libpxbackend-1.0.so: cannot open shared object file: No such file or directory
Failed to load module: /home/jon/snap/chromium/common/.cache/gio-modules/libgiolibproxy.so

(chrome:5262): Gtk-WARNING **: 15:58:17.471: Theme parsing error: gtk.css:1:21: Failed to import: Error opening file /home/jon/snap/chromium/3324/.config/gtk-3.0/co
lors.css: No such file or directory
MESA-INTEL: warning: Haswell Vulkan support is incomplete
MESA-INTEL: warning: Haswell Vulkan support is incomplete
[5262:5426:1224/155822.481138:ERROR:google_apis/gcm/engine/registration_request.cc:292] Registration response error message: DEPRECATED_ENDPOINT
[5262:5426:1224/155846.432010:ERROR:google_apis/gcm/engine/registration_request.cc:292] Registration response error message: DEPRECATED_ENDPOINT
[5262:5262:1224/155928.331803:ERROR:ui/compositor/compositor_animation_observer.cc:65] CompositorAnimationObserver is active for too long (68.5076s) location=TabIco
n@chrome/browser/ui/views/tabs/tab_icon.cc:95
[5262:5426:1224/155944.339213:ERROR:google_apis/gcm/engine/registration_request.cc:292] Registration response error message: DEPRECATED_ENDPOINT

Then it starts over. Google-chrome is shorter:

MESA-INTEL: warning: Haswell Vulkan support is incomplete
Created TensorFlow Lite XNNPACK delegate for CPU.
[4942:4968:1224/155726.534304:ERROR:crypto/nss_util.cc:346] After loading Root Certs, loaded==false: NSS error code: -8018
[4942:4967:1224/155727.212383:ERROR:components/signin/public/webdata/token_service_table.cc:220] Failed to decrypt token for service AccountId-101535288967165606172
[4942:4942:1224/155727.330757:ERROR:components/signin/internal/identity_manager/account_info_fetcher.cc:65] OnGetTokenFailure: Invalid credentials (credentials miss
ing).
[4942:4971:1224/155730.850088:ERROR:google_apis/gcm/engine/registration_request.cc:292] Registration response error message: DEPRECATED_ENDPOINT
[4942:4971:1224/155759.564234:ERROR:google_apis/gcm/engine/registration_request.cc:292] Registration response error message: DEPRECATED_ENDPOINT
[4942:4971:1224/155845.072567:ERROR:google_apis/gcm/engine/registration_request.cc:292] Registration response error message: DEPRECATED_ENDPOINT
MESA-INTEL: warning: Haswell Vulkan support is incomplete
Warning: maxDynamicUniformBuffersPerPipelineLayout artificially reduced from 1000000 to 16 to fit dynamic offset allocation limit.
Warning: maxDynamicStorageBuffersPerPipelineLayout artificially reduced from 1000000 to 16 to fit dynamic offset allocation limit.
[4942:4942:1224/160025.159628:ERROR:services/on_device_model/public/cpp/service_client.cc:36] Unexpected on_device_model service disconnect:
[4942:4971:1224/160044.763247:ERROR:google_apis/gcm/engine/registration_request.cc:292] Registration response error message: DEPRECATED_ENDPOINT
[4942:4971:1224/160444.636171:ERROR:google_apis/gcm/engine/registration_request.cc:292] Registration response error message: DEPRECATED_ENDPOINT
[4942:4971:1224/161110.637560:ERROR:google_apis/gcm/engine/registration_request.cc:292] Registration response error message: DEPRECATED_ENDPOINT

Opera, too:

MESA-INTEL: warning: Haswell Vulkan support is incomplete
[5754:5754:1224/155947.843569:ERROR:extensions/common/url_pattern_set.cc:298] Invalid url pattern: chrome://startpage/*
[5754:5754:1224/155947.843905:ERROR:extensions/common/url_pattern_set.cc:298] Invalid url pattern: chrome://startpage/*
[5754:5754:1224/155947.845544:ERROR:extensions/common/url_pattern_set.cc:298] Invalid url pattern: chrome://startpage/*
[5754:5754:1224/155947.845638:ERROR:extensions/common/url_pattern_set.cc:298] Invalid url pattern: chrome://startpage/*
[5754:5773:1224/155949.999054:ERROR:crypto/nss_util.cc:346] After loading Root Certs, loaded==false: NSS error code: -8018
[5754:5790:1224/155959.418407:ERRORpera/opera_components/content_filter/domains_info.cc:38] Unknown category: consentmanagers
[5803:5808:1224/160003.618397:ERROR:net/socket/ssl_client_socket_impl.cc:902] handshake failed; returned -1, SSL error code 1, net_error -200
[5754:5790:1224/160004.106269:ERRORpera/opera_components/content_filter/domains_info.cc:38] Unknown category: consentmanagers
[5754:5773:1224/160015.744812:ERRORpera/opera_components/content_filter/domains_info.cc:38] Unknown category: consentmanagers

After dev vivaldi hung, it removed it and installed the snap version. Same result:

snap run vivaldi.vivaldi-stable

(vivaldi:12828): Gtk-WARNING **: 16:58:28.415: Theme parsing error: gtk.css:1:21: Failed to import: Error opening file /home/jon/snap/vivaldi/322/.config/gtk-3.0/co
lors.css: No such file or directory
[12828:12828:1224/165828.941800:ERROR:chromium/ui/ozone/platform/wayland/host/wayland_wp_color_manager.cc:273] Unable to set image transfer function.
[12828:12828:1224/165828.941951:ERROR:chromium/ui/ozone/platform/wayland/host/wayland_wp_color_manager.cc:191] Failed to populate image description for color space
{primaries:BT709, transfer:SRGB, matrix:RGB, range:FULL}
Fontconfig error: Cannot load default config file: File not found: /snap/vivaldi/322/gnome-platform/etc/fonts/fonts.conf
[12828:12828:1224/165829.020178:ERROR:chromium/ui/ozone/platform/wayland/host/wayland_wp_color_manager.cc:273] Unable to set image transfer function.
[12828:12828:1224/165829.020198:ERROR:chromium/ui/ozone/platform/wayland/host/wayland_wp_color_manager.cc:191] Failed to populate image description for color space
{primaries:BT709, transfer:SRGB, matrix:RGB, range:FULL}
[12828:12828:1224/165829.020218:ERROR:chromium/ui/ozone/platform/wayland/host/wayland_wp_color_management_surface.cc:63] Failed to get image description for color s
pace.

At first, I noticed the Vulkan (whatever that is) problem. But they don't all have it. Anyone else have similar problems? Or, better yet, solutions?