This is difference between the default preference of Firefox 119.0 beta 6 and one of 118.0.1. This diff table is generated with my small script firefox-prefjs-surveyer.

Preference difference
PrefFirefox 119.0.1Firefox 119.0 beta 6
accessibility.ARIAReflection.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-desktop&utm_campaign=whatsnew https://www.mozilla.org/%LOCALE%/firefox/%VERSION%beta/releasenotes/?utm_source=firefox-browser&utm_medium=firefox-desktop&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.contentblocking.features.strict tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cm,fp,stp,emailTP,emailTPPrivate,lvl2,rp,rpTop,ocsp,qps,qpsPBM tp,tpPrivate,cookieBehavior5,cookieBehaviorPBM5,cm,fp,stp,emailTP,emailTPPrivate,lvl2,rp,rpTop,ocsp,qps,qpsPBM,fpp,fppPrivate
browser.firefox-view.max-history-rows 500 300
browser.fixup.alternate.enabled false undefined
browser.migrate.chrome.extensions.enabled false true
browser.newtabpage.activity-stream.discoverystream.spocTopsitesPlacement.enabled undefined true
browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts.searchEngines google,amazon
browser.newtabpage.activity-stream.telemetry.ut.events false true
browser.places.interactions.enabled undefined true
browser.privatebrowsing.enable-new-indicator true undefined
browser.privatebrowsing.enable-new-logo true undefined
browser.search.serpEventTelemetry.enabled false true
browser.search.serpEventTelemetryCategorization.enabled undefined false
browser.sessionstore.closedTabsFromAllWindows false true
browser.sessionstore.closedTabsFromClosedWindows false true
browser.sessionstore.persist_closed_tabs_between_sessions false true
browser.shopping.experience2023.ads.enabled true false
browser.shopping.experience2023.ads.userEnabled undefined false
browser.shopping.experience2023.survey.enabled undefined true
browser.shopping.experience2023.survey.hasSeen undefined false
browser.shopping.experience2023.survey.pdpVisits undefined 0
browser.tabs.firefox-view-newIcon undefined true
browser.tabs.firefox-view-next false true
browser.tabs.remote.coep.credentialless false true
browser.topsites.contile.sov.enabled false true
browser.underline_anchors true undefined
browser.urlbar.quickactions.enabled undefined true
browser.urlbar.quickactions.showPrefs undefined true
browser.urlbar.shortcuts.quickactions undefined true
browser.urlbar.showSearchTerms.featureGate false true
browser.urlbar.suggest.quickactions undefined true
browser.urlbar.trending.featureGate undefined true
canvas.createConicGradient.enabled true undefined
cookiebanners.ui.desktop.enabled false true
devtools.debugger.features.map-scopes true undefined
devtools.inspector.ruleview.inline-compatibility-warning.enabled true undefined
dom.animations-api.autoremove.enabled true undefined
dom.animations-api.core.enabled true undefined
dom.animations-api.implicit-keyframes.enabled true undefined
dom.document.edit_command.contentReadOnly.enabled true false
dom.document.edit_command.insertBrOnReturn.enabled true false
dom.enable_window_print true undefined
dom.event.keypress.key.allow_lone_surrogate true false
dom.events.phases.correctOrderOnTarget false true
dom.focus.fixup true undefined
dom.forms.always_allow_pointer_events.enabled false true
dom.forms.autocapitalize true undefined
dom.forms.fieldset_disable_only_descendants.enabled false true
dom.forms.inputmode true undefined
dom.input_events.security.isUserInputHandlingDelayTest undefined false
dom.input_events.security.minNumTicks undefined 3
dom.input_events.security.minTimeElapsedInMS undefined 100
dom.media.mediasession.enabled true undefined
dom.mouseevent.click.hack.use_legacy_non-primary_dispatch undefined
dom.picture_source_dimension_attributes.enabled true undefined
dom.storageManager.enabled true undefined
dom.visualviewport.enabled true undefined
dom.webgpu.swap-chain.external-texture-dx12 undefined false
dom.weblocks.enabled true undefined
dom.window.sidebar.enabled false undefined
dom.workers.importScripts.enforceStrictMimeType false true
dom.workers.requestAnimationFrame true undefined
extensions.InstallTrigger.enabled true false
extensions.webcompat-reporter.enabled false true
extensions.webcompat.useScriptingAPI undefined true
fission.enforceBlocklistedPrefsInSubprocesses 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.downloadable_fonts.sanitize_omt true undefined
html5.inert.enabled true undefined
image.webp.enabled true undefined
javascript.options.array_grouping undefined true
javascript.options.mem.gc_parallel_marking_threshold_kb 200000 undefined
javascript.options.mem.gc_parallel_marking_threshold_mb undefined 200
javascript.options.spectre.disable_for_isolated_content false true
javascript.options.wasm_final_types false undefined
javascript.options.well_formed_unicode_strings undefined true
layout.css.allow-mixed-page-sizes false true
layout.css.font-loading-api.enabled true undefined
layout.css.font-loading-api.workers.enabled true undefined
layout.css.font-metrics-overrides.enabled true undefined
layout.css.grid-item-baxis-measurement.enabled true undefined
layout.css.hyphenate-character.enabled true undefined
layout.css.line-height-moz-block-height.content.enabled false undefined
layout.css.linear-easing-function.enabled true undefined
layout.css.motion-path.enabled true undefined
layout.css.moz-broken.content.enabled undefined false
layout.css.moz-document.content.enabled false undefined
layout.css.overflow-logical.enabled true undefined
layout.css.page-size.enabled true undefined
layout.css.scrollbar-gutter.enabled true undefined
layout.dynamic-reflow-roots.enabled false true
layout.oopif_activity_grace_period_ms 1000 undefined
media.allow-audio-non-utility true false
media.gmp.use-minimal-xpcom false true
media.webrtc.platformencoder false true
memory.phc.enabled undefined false
network.auth.allow_multiple_challenges_same_line true undefined
network.auth.use_new_parse_realm true undefined
network.cookie.rejectForeignWithExceptions.enabled false undefined
network.cookie.sameSite.noneRequiresSecure false true
network.dns.limit_253_chars true undefined
network.dns.skipTRR-when-parental-control-enabled true undefined
network.early-hints.enabled false true
network.early-hints.preconnect.enabled false true
network.fetchpriority.enabled undefined false
network.http.http3.cc_algorithm undefined 1
network.jar.record_failure_reason false true
network.predictor.enable-prefetch false true
pdfjs.enableStampEditor false true
privacy.annotate_channels.strict_list.enabled false true
privacy.partition.bloburl_per_partition_key false true
security.block_fileuri_script_with_wrong_mime false true
security.disallow_non_local_systemprincipal_in_tests undefined false
security.insecure_connection_icon.enabled true undefined
security.insecure_connection_icon.pbmode.enabled true undefined
security.mixed_content.upgrade_display_content.audio undefined true
security.mixed_content.upgrade_display_content.image undefined false
security.mixed_content.upgrade_display_content.video undefined true
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
svg.nearestAndFarthestViewportElement.enabled true false
toolkit.telemetry.enabled false true
ui.use_activity_cursor false undefined
webgl.max-vert-ids-per-draw undefined 30000000
widget.dmabuf.enabled undefined true
widget.gtk.hide-pointer-while-typing.enabled undefined true
widget.gtk.rounded-bottom-corners.enabled undefined false