This is difference between the default preference of Firefox 110.0 beta 3 and one of 109.0. This diff table is generated with my small script firefox-prefjs-surveyer.

Preference difference
PrefFirefox 109.0Firefox 110.0 beta 3
accessibility.cache.enabled false true
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/new?reason=manual-update https://www.mozilla.org/%LOCALE%/firefox/beta?reason=manual-update
browser.aboutwelcome.showModal undefined false
browser.cache.offline.enable true false
browser.contentblocking.features.strict tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cm,fp,stp,lvl2,rp,rpTop,ocsp,qps,qpsPBM tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cm,fp,stp,lvl2,lvl2PBM,rp,rpTop,ocsp,qps,qpsPBM
browser.migrate.opera-gx.enabled false true
browser.migrate.opera.enabled false true
browser.migrate.vivaldi.enabled false true
browser.newtabpage.activity-stream.telemetry.ut.events false true
browser.opaqueResponseBlocking.javascriptValidator undefined false
browser.places.snapshots.expiration.days 210 undefined
browser.places.snapshots.expiration.userManaged.days 420 undefined
browser.places.snapshots.relevancy.timeOfDayIntervalSeconds 3600 undefined
browser.places.snapshots.score.CurrentSession 1 undefined
browser.places.snapshots.score.IsUserPersisted 1 undefined
browser.places.snapshots.score.IsUserRemoved -10 undefined
browser.places.snapshots.score.Visit 1 undefined
browser.places.snapshots.source.CommonReferrer 3 undefined
browser.places.snapshots.source.Overlapping 3 undefined
browser.places.snapshots.source.TimeOfDay 3 undefined
browser.theme.colorway-migration undefined false
browser.urlbar.quickactions.enabled undefined true
browser.urlbar.quickactions.showInZeroPrefix undefined false
browser.urlbar.quickactions.showPrefs undefined true
browser.urlbar.shortcuts.quickactions undefined true
browser.urlbar.showSearchTerms.featureGate false true
browser.urlbar.suggest.quickactions undefined true
content.sink.perf_parse_time 360000 30000
cookiebanners.listService.testSkipRemoteSettings undefined false
devtools.browserconsole.contentMessages false undefined
devtools.browsertoolbox.fission true undefined
docshell.shistory.bfcache.ship_allow_beforeunload_listeners false true
dom.document.edit_command.contentReadOnly.enabled true false
dom.document.edit_command.insertBrOnReturn.enabled true false
dom.focus.fixup false true
dom.fs.main_thread_writable_file_stream false undefined
dom.fs.writable_file_stream.enabled undefined false
dom.media.autoplay-policy-detection.enabled undefined false
dom.mozTextStyle.enabled true false
dom.security.credentialmanagement.identity.reject_delay.duration_ms undefined 120000
dom.security.credentialmanagement.identity.reject_delay.enabled undefined true
dom.security.sanitizer.rewrite_no_bounty false undefined
dom.security.setHTML.enabled undefined false
dom.streams.byte_streams.enabled true undefined
dom.streams.pipeTo.enabled true undefined
dom.streams.readable_stream_default_controller.enabled true undefined
dom.streams.readable_stream_default_reader.enabled true undefined
dom.streams.transferable.enabled true undefined
dom.streams.transform_streams.enabled true undefined
dom.streams.writable_streams.enabled true undefined
editor.inline_style.range.compatible_with_the_other_browsers undefined true
extensions.InstallTrigger.enabled true false
extensions.formautofill.creditCards.hideui false undefined
extensions.formautofill.creditCards.used 0 undefined
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.canvas.accelerated false true
gfx.canvas.accelerated.debug undefined false
gfx.canvas.accelerated.force-enabled undefined false
html5.inert.enabled false true
html5.offmainthread true undefined
javascript.options.large_arraybuffers true undefined
layout.css.caption-side-non-standard.enabled false undefined
layout.css.container-queries.enabled false true
layout.css.floating-first-letter.tight-glyph-bounds undefined 1
layout.css.grid-template-subgrid-value.enabled true undefined
layout.css.named-pages.enabled false true
layout.css.nth-child-of.enabled undefined false
layout.css.overflow-overlay.enabled undefined false
layout.css.scroll-driven-animations.enabled undefined false
layout.css.scroll-linked-animations.enabled false undefined
layout.dynamic-reflow-roots.enabled false true
media.forcestereo.enabled true false
media.getusermedia.camera.macavf.enabled undefined true
media.peerconnection.allow_old_setParameters undefined true
media.peerconnection.simulcast true undefined
media.video-wakelock undefined true
media.webrtc.capture.allow-iosurface true undefined
media.webrtc.capture.allow-pipewire undefined true
media.webrtc.platformencoder.sw_mft false true
network.cache.frecency_array_check_enabled false true
network.cookie.move.interval_sec 0 undefined
network.cookie.sameSite.laxByDefault false true
network.cookie.sameSite.noneRequiresSecure false true
network.cors_preflight.block_userpass_uri undefined false
network.early-hints.parent-connect-timeout undefined 10000
network.early-hints.preconnect.enabled undefined false
network.http.http2.websockets false true
network.http.useragent.forceRVOnly undefined 109
network.jar.record_failure_reason false true
network.predictor.enable-prefetch false true
network.trr_ui.skip_reason_learn_more_url undefined https://firefox-source-docs.mozilla.org/networking/dns/trr-skip-reasons.html#
network.webtransport.datagram_size undefined 1200
network.webtransport.redirect.enabled undefined false
pdfjs.defaultZoomDelay undefined 400
privacy.annotate_channels.strict_list.enabled false true
privacy.annotate_channels.strict_list.pbmode.enabled undefined true
privacy.restrict3rdpartystorage.rollout.preferences.TCPToggleInStandard false undefined
privacy.restrict3rdpartystorage.rollout.preferences.learnMoreURLSuffix total-cookie-protection undefined
security.block_fileuri_script_with_wrong_mime false true
security.disallow_non_local_systemprincipal_in_tests undefined false
security.remote_settings.crlite_filters.enabled false true
security.ssl3.ecdhe_ecdsa_aes_128_sha true false
security.ssl3.ecdhe_ecdsa_aes_256_sha true false
services.sync.engine.bookmarks.validation.enabled undefined true
services.sync.engine.passwords.validation.enabled undefined true
signon.firefoxRelay.base_url undefined https://relay.firefox.com/api/v1/
signon.firefoxRelay.feature undefined not available
signon.firefoxRelay.learn_more_url undefined https://relay.firefox.com/
svg.nearestAndFarthestViewportElement.enabled true false
toolkit.shutdown.lateWriteChecksStage 3 2
toolkit.telemetry.enabled false true
webgl.force-layers-readback false undefined
webgl.out-of-process.async-present false true
widget.gtk.grab-pointer undefined 2