This is difference between the default preference of Firefox 97.0 beta 3 and one of 96.0.1. This diff table is generated with my small script firefox-prefjs-surveyer.

Preference difference
PrefFirefox 96.0.1Firefox 97.0 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?reason=manual-update
browser.cache.offline.enable true false
browser.download.improvements_to_download_panel false true
browser.newtabpage.activity-stream.discoverystream.compactGrid.enabled undefined false
browser.newtabpage.activity-stream.discoverystream.compactImages.enabled undefined false
browser.newtabpage.activity-stream.discoverystream.descLines undefined 3
browser.newtabpage.activity-stream.discoverystream.editorsPicksHeader.enabled undefined false
browser.newtabpage.activity-stream.discoverystream.essentialReadsHeader.enabled undefined false
browser.newtabpage.activity-stream.discoverystream.hideDescriptions.enabled undefined false
browser.newtabpage.activity-stream.discoverystream.imageGradient.enabled undefined false
browser.newtabpage.activity-stream.discoverystream.newSponsoredLabel.enabled undefined false
browser.newtabpage.activity-stream.discoverystream.readTime.enabled undefined false
browser.newtabpage.activity-stream.discoverystream.titleLines undefined 3
browser.newtabpage.activity-stream.telemetry.ut.events false true
browser.proton.enabled true undefined
browser.search.update.interval 21600 undefined
browser.search.update.log false undefined
browser.startup.upgradeDialog.enabled true false
browser.urlbar.quicksuggest.allowPositionInSuggestions undefined true
browser.urlbar.suggest.remotetab undefined true
browser.vpn_promo.disallowed_regions undefined ae,by,cn,cu,iq,ir,kp,om,ru,sd,sy,tm,tr,ua
browser.vpn_promo.enabled undefined true
devtools.debugger.tabsBlackBoxed [] undefined
devtools.every-frame-target.enabled false true
devtools.netmonitor.features.newEditAndResend undefined false
devtools.webconsole.input.context false true
dom.image-lazy-loading.root-margin.bottom 300.0 500.0
dom.image-lazy-loading.root-margin.left 300.0 500.0
dom.image-lazy-loading.root-margin.right 300.0 500.0
dom.image-lazy-loading.root-margin.top 300.0 500.0
dom.maxHardwareConcurrency 16 128
dom.quotaManager.temporaryStorage.chunkSize 10240 undefined
dom.screenorientation.allow-lock undefined false
dom.securecontext.allowlist_onions undefined false
dom.securecontext.whitelist_onions false undefined
dom.svg.pathSeg.enabled undefined false
dom.webmidi.gated undefined true
dom.window.content.untrusted.enabled true false
dom.window.sidebar.enabled true false
editor.background_color undefined #FFFFFF
editor.hr_element.allow_to_delete_from_following_line false true
extensions.pocket.refresh.emailButton.enabled undefined false
extensions.pocket.refresh.layout.enabled undefined false
extensions.webcompat-reporter.enabled false true
fission.autostart false true
fission.autostart.session false true
fission.openNonFissionWindowOption false undefined
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%
intl.hyphenation-alias.as undefined bn
intl.hyphenation-alias.as-* undefined bn
intl.hyphenation-alias.bn-* undefined bn
intl.hyphenation-alias.gu-* undefined gu
intl.hyphenation-alias.hi-* undefined hi
intl.hyphenation-alias.kn-* undefined kn
intl.hyphenation-alias.ml-* undefined ml
intl.hyphenation-alias.mr undefined hi
intl.hyphenation-alias.mr-* undefined hi
intl.hyphenation-alias.or-* undefined or
intl.hyphenation-alias.pa-* undefined pa
intl.hyphenation-alias.ta-* undefined ta
intl.hyphenation-alias.te-* undefined te
javascript.options.wasm_caching false true
javascript.options.wasm_simd_wormhole undefined false
layers.acceleration.draw-fps false undefined
layout.css.cascade-layers.enabled false true
layout.css.d-property.enabled false true
layout.css.hyphenate-character.enabled undefined false
layout.css.named-pages.enabled undefined false
layout.css.scrollbar-gutter.enabled false true
layout.css.touch_action.enabled true undefined
layout.dynamic-reflow-roots.enabled false true
layout.oopif_activity_grace_period_ms undefined 1000
layout.throttled_frame_rate undefined 1
layout.visibility.min-recompute-interval-ms undefined 1000
media.audio.playbackrate.muting_threshold undefined 8
media.audio.playbackrate.soundtouch_overlap_ms undefined 8
media.audio.playbackrate.soundtouch_seekwindow_ms undefined 15
media.audio.playbackrate.soundtouch_sequence_ms undefined 10
media.cubeb.sandbox_v2 undefined false
media.gmp-manager.checkContentSignature undefined true
media.peerconnection.mtransport_process false true
media.rdd-ffmpeg.enabled false true
media.videocontrols.picture-in-picture.allow-multiple true undefined
media.videocontrols.picture-in-picture.video-toggle.visibility-threshold undefined 0.9
media.webrtc.software_encoder.fallback undefined false
network.auth.choose_most_secure_challenge undefined true
network.cache.frecency_array_check_enabled false true
network.http.referer.disallowCrossSiteRelaxingDefault false true
network.jar.record_failure_reason false true
network.predictor.enable-prefetch false true
network.process.enabled false true
network.proxy.allow_bypass undefined true
network.url.max-length 0 33554432
print.cups.enum_dests_timeout_ms undefined 150
print.show_page_setup_menu undefined false
print.tab_modal.enabled true undefined
privacy.annotate_channels.strict_list.enabled false true
privacy.antitracking.cacheStorageAllowedForWindow true undefined
security.disallow_non_local_systemprincipal_in_tests undefined false
security.intermediate_preloading_healer.enabled false true
security.remote_settings.crlite_filters.enabled false true
services.sync.engine.bookmarks.validation.enabled undefined true
services.sync.engine.passwords.validation.enabled undefined true
toolkit.telemetry.enabled false true
ui.key.textcontrol.prefer_native_key_bindings_over_builtin_shortcut_key_definitions false true
ui.key.use_select_all_in_single_line_editor false true
widget.non-native-theme.win11.scrollbar.force-overlay-style undefined false
widget.use-xdg-desktop-portal false undefined
widget.use-xdg-desktop-portal.file-picker undefined 2
widget.use-xdg-desktop-portal.mime-handler undefined 2
widget.use-xdg-desktop-portal.print undefined 2