This is difference between the default preference of Firefox 103.0 beta 3 and one of 102.0. This diff table is generated with my small script firefox-prefjs-surveyer.

Preference difference
PrefFirefox 102.0Firefox 103.0 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/new?reason=manual-update https://www.mozilla.org/%LOCALE%/firefox/beta?reason=manual-update
browser.aboutwelcome.templateMR undefined false
browser.cache.offline.enable true false
browser.display.os-zoom-behavior undefined 1
browser.newtabpage.activity-stream.discoverystream.compactLayout.enabled false undefined
browser.newtabpage.activity-stream.discoverystream.recentSaves.enabled undefined false
browser.newtabpage.activity-stream.telemetry.ut.events false true
browser.preferences.instantApply true undefined
browser.safebrowsing.provider.mozilla.lists base-track-digest256,mozstd-trackwhite-digest256,google-trackwhite-digest256,content-track-digest256,mozplugin-block-digest256,mozplugin2-block-digest256,block-flash-digest256,except-flash-digest256,allow-flashallow-digest256,except-flashallow-digest256,block-flashsubdoc-digest256,except-flashsubdoc-digest256,ads-track-digest256,social-track-digest256,analytics-track-digest256,base-fingerprinting-track-digest256,content-fingerprinting-track-digest256,base-cryptomining-track-digest256,content-cryptomining-track-digest256,fanboyannoyance-ads-digest256,fanboysocial-ads-digest256,easylist-ads-digest256,easyprivacy-ads-digest256,adguard-ads-digest256,social-tracking-protection-digest256,social-tracking-protection-facebook-digest256,social-tracking-protection-linkedin-digest256,social-tracking-protection-twitter-digest256 base-track-digest256,mozstd-trackwhite-digest256,google-trackwhite-digest256,content-track-digest256,mozplugin-block-digest256,mozplugin2-block-digest256,ads-track-digest256,social-track-digest256,analytics-track-digest256,base-fingerprinting-track-digest256,content-fingerprinting-track-digest256,base-cryptomining-track-digest256,content-cryptomining-track-digest256,fanboyannoyance-ads-digest256,fanboysocial-ads-digest256,easylist-ads-digest256,easyprivacy-ads-digest256,adguard-ads-digest256,social-tracking-protection-digest256,social-tracking-protection-facebook-digest256,social-tracking-protection-linkedin-digest256,social-tracking-protection-twitter-digest256
devtools.browserconsole.enableNetworkMonitoring undefined false
devtools.browsertoolbox.scope undefined everything
devtools.devices.url https://code.cdn.mozilla.net/devices/devices.json undefined
devtools.netmonitor.features.serverSentEvents true undefined
devtools.netmonitor.features.webSockets true undefined
devtools.remote.tls-handshake-timeout 10000 undefined
dom.block_reload_from_resize_event_handler true false
dom.events.asyncClipboard.readText undefined false
dom.fileHandle.enabled true false
dom.fullscreen.modal undefined false
dom.image-lazy-loading.root-margin.bottom 300.0 100.0
dom.image-lazy-loading.root-margin.bottom.percentage false true
dom.image-lazy-loading.root-margin.left 300.0 100.0
dom.image-lazy-loading.root-margin.left.percentage false true
dom.image-lazy-loading.root-margin.right 300.0 100.0
dom.image-lazy-loading.root-margin.right.percentage false true
dom.image-lazy-loading.root-margin.top 300.0 100.0
dom.image-lazy-loading.root-margin.top.percentage false true
dom.ipc.shims.enabledWarnings false undefined
dom.menuitem.enabled false undefined
dom.mozCurrentTransform.enabled true false
dom.streams.transferable.enabled false true
dom.text-recognition.enabled undefined false
dom.webidl.crosscontext_hasinstance.enabled true false
dom.webmidi.enabled false true
extensions.InstallTrigger.enabled true false
extensions.InstallTriggerImpl.enabled true false
extensions.webcompat-reporter.enabled false true
fission.enforceBlocklistedPrefsInSubprocesses.tmp undefined false
fission.frontend.simulate-events false undefined
fission.frontend.simulate-messages false undefined
fission.omitBlocklistedPrefsInSubprocesses.tmp undefined false
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.direct3d11.reuse-decoder-device -1 1
html5.inert.enabled false true
image.decode-sync.enabled undefined false
javascript.options.experimental.array_find_last undefined false
javascript.options.wasm_simd_wormhole undefined false
layout.css.backdrop-filter.enabled false true
layout.css.has-selector.enabled undefined false
layout.css.linear-easing-function.enabled undefined false
layout.display_partial_background_images false true
layout.dynamic-reflow-roots.enabled false true
layout.expose_high_rate_mode_from_refreshdriver undefined true
mathml.scriptminsize_attribute.disabled false true
mathml.scriptsizemultiplier_attribute.disabled false true
media.autoplay.block-webaudio false true
media.av1.force-thread-count undefined 0
media.av1.new-thread-count-strategy undefined false
media.videocontrols.picture-in-picture.display-text-tracks.toggle.enabled undefined true
media.webrtc.platformencoder.sw_mft false true
network.allow_raw_sockets_in_content_processes undefined false
network.cache.frecency_array_check_enabled false true
network.cookie.sameSite.laxByDefault false true
network.cookie.sameSite.noneRequiresSecure false true
network.cookie.sameSite.schemeful false true
network.http.origin.redirectTainted undefined true
network.jar.record_failure_reason false true
network.predictor.enable-prefetch false true
network.trr.retry_on_recoverable_errors undefined true
pdfjs.annotationEditorEnabled undefined false
plugins.flashBlock.enabled true undefined
privacy.annotate_channels.strict_list.enabled false true
privacy.query_stripping.enabled.pbmode false true
privacy.restrict3rdpartystorage.preferences.learnMoreURLSuffix undefined total-cookie-protection
reader.improvements_H12022.enabled false undefined
security.block_fileuri_script_with_wrong_mime false true
security.disallow_non_local_systemprincipal_in_tests undefined false
security.pki.sha1_enforcement_level 1 undefined
security.remote_settings.crlite_filters.enabled false true
security.tls.ech.disable_grease_on_fallback undefined true
security.tls.ech.grease_probability undefined 50
security.tls.ech.grease_size undefined 100
security.webauthn.ctap2 undefined false
services.sync.engine.bookmarks.validation.enabled undefined true
services.sync.engine.passwords.validation.enabled undefined true
services.sync.engine.tabs.filteredSchemes about|resource|chrome|file|blob|moz-extension about|resource|chrome|file|blob|moz-extension|data
toolkit.telemetry.enabled false true
urlclassifier.disallow_completions goog-downloadwhite-digest256,base-track-digest256,mozstd-trackwhite-digest256,content-track-digest256,mozplugin-block-digest256,mozplugin2-block-digest256,block-flash-digest256,except-flash-digest256,allow-flashallow-digest256,except-flashallow-digest256,block-flashsubdoc-digest256,except-flashsubdoc-digest256,goog-passwordwhite-proto,ads-track-digest256,social-track-digest256,analytics-track-digest256,base-fingerprinting-track-digest256,content-fingerprinting-track-digest256,base-cryptomining-track-digest256,content-cryptomining-track-digest256,fanboyannoyance-ads-digest256,fanboysocial-ads-digest256,easylist-ads-digest256,easyprivacy-ads-digest256,adguard-ads-digest256,social-tracking-protection-digest256,social-tracking-protection-facebook-digest256,social-tracking-protection-linkedin-digest256,social-tracking-protection-twitter-digest256 goog-downloadwhite-digest256,base-track-digest256,mozstd-trackwhite-digest256,content-track-digest256,mozplugin-block-digest256,mozplugin2-block-digest256,goog-passwordwhite-proto,ads-track-digest256,social-track-digest256,analytics-track-digest256,base-fingerprinting-track-digest256,content-fingerprinting-track-digest256,base-cryptomining-track-digest256,content-cryptomining-track-digest256,fanboyannoyance-ads-digest256,fanboysocial-ads-digest256,easylist-ads-digest256,easyprivacy-ads-digest256,adguard-ads-digest256,social-tracking-protection-digest256,social-tracking-protection-facebook-digest256,social-tracking-protection-linkedin-digest256,social-tracking-protection-twitter-digest256
urlclassifier.flashAllowExceptTable except-flashallow-digest256 undefined
urlclassifier.flashAllowTable allow-flashallow-digest256 undefined
urlclassifier.flashExceptTable except-flash-digest256 undefined
urlclassifier.flashSubDocExceptTable except-flashsubdoc-digest256 undefined
urlclassifier.flashSubDocTable block-flashsubdoc-digest256 undefined
urlclassifier.flashTable block-flash-digest256 undefined
widget.swipe.whole-page-pixel-size 550.0 40.0
widget.use-xdg-desktop-portal.open-uri undefined 2