This is difference between the default preference of Firefox 93.0 beta 3 and one of 92.0. This diff table is generated with my small script firefox-prefjs-surveyer.

Preference difference
PrefFirefox 92.0Firefox 93.0 beta 3
app.normandy.test-prefs.bool undefined false
app.normandy.test-prefs.integer undefined 0
app.normandy.test-prefs.string undefined
app.releaseNotesURL https://www.mozilla.org/%LOCALE%/firefox/%VERSION%/releasenotes/?utm_source=firefox-browser&utm_medium=firefox-browser&utm_campaign=whatsnew https://www.mozilla.org/%LOCALE%/firefox/%VERSION%beta/releasenotes/?utm_source=firefox-browser&utm_medium=firefox-browser&utm_campaign=whatsnew
app.releaseNotesURL.aboutDialog https://www.mozilla.org/%LOCALE%/firefox/%VERSION%/releasenotes/?utm_source=firefox-browser&utm_medium=firefox-desktop&utm_campaign=about-dialog https://www.mozilla.org/%LOCALE%/firefox/%VERSION%beta/releasenotes/?utm_source=firefox-browser&utm_medium=firefox-desktop&utm_campaign=about-dialog
app.update.channel release beta
app.update.url.details https://www.mozilla.org/%LOCALE%/firefox/notes https://www.mozilla.org/%LOCALE%/firefox/beta/notes
app.update.url.manual https://www.mozilla.org/%LOCALE%/firefox/ https://www.mozilla.org/%LOCALE%/firefox/beta
browser.cache.offline.enable true false
browser.contentblocking.features.strict tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cm,fp,stp,lvl2 tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cm,fp,stp,lvl2,rp
browser.newtabpage.activity-stream.asrouter.providers.cfr-fxa {"id":"cfr-fxa","enabled":true,"type":"remote-settings","bucket":"cfr-fxa","updateCycleInMs":3600000} undefined
browser.newtabpage.activity-stream.asrouter.providers.messaging-experiments {"id":"messaging-experiments","enabled":true,"type":"remote-experiments","messageGroups":["cfr","whats-new-panel","moments-page","cfr-fxa","aboutwelcome","infobar"],"updateCycleInMs":3600000} {"id":"messaging-experiments","enabled":true,"type":"remote-experiments","messageGroups":["cfr","whats-new-panel","moments-page","aboutwelcome","infobar","spotlight"],"updateCycleInMs":3600000}
browser.newtabpage.activity-stream.filterAdult true undefined
browser.newtabpage.activity-stream.telemetry.ut.events false true
browser.places.interactions.scrolling_timeout_ms undefined 5000
browser.tabs.remote.subframesPreferUsed undefined true
browser.tabs.remote.systemTriggeredAboutBlankAnywhere undefined false
browser.tabs.unloadOnLowMemory false true
browser.urlbar.merino.enabled undefined false
browser.urlbar.merino.endpointURL undefined https://merino.services.mozilla.com/api/v1/suggest
browser.urlbar.quicksuggest.remoteSettings.enabled undefined true
browser.urlbar.quicksuggest.scenario undefined history
browser.urlbar.quicksuggest.showOnboardingDialogAfterNRestarts 2 0
browser.urlbar.suggest.quicksuggest true false
browser.urlbar.suggest.quicksuggest.sponsored undefined false
devtools.target-switching.server.enabled false true
dom.block_download_insecure false true
dom.event.coalesce_mouse_move true undefined
dom.events.coalesce.mousemove undefined true
dom.forms.datetime-local false true
dom.forms.datetime-local.widget false true
dom.image-lazy-loading.root-margin.bottom 300.0 800.0
dom.image-lazy-loading.root-margin.left 300.0 800.0
dom.image-lazy-loading.root-margin.right 300.0 800.0
dom.image-lazy-loading.root-margin.top 300.0 800.0
dom.keyboardevent.init_key_event.enabled undefined false
dom.keyboardevent.init_key_event.enabled_in_addons undefined true
dom.quotaManager.checkQuotaInfoLoadTime undefined true
dom.quotaManager.longQuotaInfoLoadTimeThresholdMs undefined 21000
dom.quotaManager.unaccessedForLongTimeThresholdSec undefined 33696000
dom.security.https_only_check_path_upgrade_downgrade_endless_loop undefined true
dom.serviceWorkers.mitigations.group_usage_headroom_kb undefined 409600
dom.webcomponents.elementInternals.enabled undefined true
dom.weblocks.enabled undefined false
dom.window.content.untrusted.enabled true false
dom.window.sidebar.enabled true false
editor.hr_element.allow_to_delete_from_following_line false true
extensions.webcompat-reporter.enabled false true
geo.provider.network.url https://www.googleapis.com/geolocation/v1/geolocate?key=%GOOGLE_LOCATION_SERVICE_API_KEY% https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%
gfx.basic_layer_manager.force_enabled false undefined
gfx.use-glx-texture-from-pixmap false undefined
gfx.webrender.blob.paint-flashing false undefined
gfx.webrender.debug.blob.paint-flashing undefined false
gfx.webrender.debug.dl.dump-content undefined false
gfx.webrender.debug.dl.dump-content-serialized undefined false
gfx.webrender.debug.dl.dump-parent undefined false
gfx.webrender.debug.enable-capture undefined false
gfx.webrender.debug.highlight-painted-layers undefined false
gfx.webrender.dl.dump-content false undefined
gfx.webrender.dl.dump-content-serialized false undefined
gfx.webrender.dl.dump-parent false undefined
gfx.webrender.enable-capture false undefined
gfx.webrender.fallback.basic false undefined
gfx.webrender.force-legacy-layers false undefined
gfx.webrender.highlight-painted-layers false undefined
gfx.webrender.software.unaccelerated-widget.allow true undefined
gfx.xrender.enabled false undefined
image.avif.compliance_strictness 0 1
image.avif.enabled false true
javascript.options.experimental.class_static_blocks undefined true
javascript.options.mem.gc_malloc_threshold_base_mb undefined 38
javascript.options.mem.gc_urgent_threshold_mb undefined 16
javascript.options.use_fdlibm_for_sin_cos_tan undefined false
javascript.options.wasm_simd_wormhole undefined false
layers.enable-tiles-if-skia-pomtp false undefined
layers.omtp.capture-limit 26214400 undefined
layers.omtp.dump-capture false undefined
layers.omtp.enabled false undefined
layers.omtp.paint-workers -1 undefined
layers.omtp.release-capture-on-main-thread false undefined
layers.progressive-paint false undefined
layout.css.DOMMatrix.enabled true undefined
layout.css.DOMPoint.enabled true undefined
layout.css.DOMQuad.enabled true undefined
layout.css.bloom-filter-attribute-names.enabled true undefined
layout.css.bucket-attribute-names.enabled undefined true
layout.css.cascade-layers.enabled undefined false
layout.css.color-mix.color-spaces.enabled undefined false
layout.css.computed-style.new-invalid-pseudo-element-behavior undefined true
layout.css.computed-style.throw-on-invalid-pseudo false undefined
layout.css.font-synthesis-small-caps.enabled undefined true
layout.css.is-and-where-better-error-recovery.enabled true undefined
layout.css.prefers-color-scheme.content-override undefined 2
layout.dynamic-reflow-roots.enabled false true
media.clearkey.test-key-systems.enabled undefined false
media.eme.max-throughput-ms undefined 200
media.peerconnection.mtransport_process false true
network.auth.allow_multiple_challenges_same_line undefined true
network.auth.use_new_parse_realm undefined true
network.cache.frecency_array_check_enabled false true
network.http.http3.max_data undefined 25165824
network.http.http3.max_stream_data undefined 12582912
network.http.referer.disallowCrossSiteRelaxingDefault false true
network.http.referer.disallowCrossSiteRelaxingDefault.pbmode undefined true
network.jar.record_failure_reason false true
network.process.enabled false true
network.ssl_tokens_cache_enabled false true
pdfjs.annotationMode undefined 2
pdfjs.enableXfa false true
pdfjs.renderInteractiveForms true undefined
privacy.annotate_channels.strict_list.enabled false true
privacy.antitracking.cacheStorageAllowedForWindow undefined true
privacy.antitracking.enableWebcompat undefined true
privacy.storagePrincipal.enabledForTrackers false undefined
security.crash_tracking.js_load_1.maxCrashes undefined 0
security.crash_tracking.js_load_1.prevCrashes undefined 0
security.disallow_non_local_systemprincipal_in_tests undefined false
security.disallow_privileged_data_subdocuments_loads undefined false
security.disallow_privileged_https_subdocuments_loads undefined true
security.intermediate_preloading_healer.enabled false true
security.remote_settings.crlite_filters.enabled false true
security.ssl3.deprecated.rsa_des_ede3_sha undefined true
security.ssl3.rsa_des_ede3_sha true undefined
services.sync.engine.bookmarks.validation.enabled undefined true
services.sync.engine.passwords.validation.enabled undefined true
signon.usernameOnlyForm.enabled false true
toolkit.telemetry.enabled false true
webgl.auto-flush undefined true
webgl.auto-flush.gl undefined false
widget.wayland.async-clipboard.enabled undefined false
widget.wayland.async-data-transfer.enabled undefined false