This is difference between the default preference of Firefox 131.0 beta 9 and one of 130.0.1. This diff table is generated with my small script firefox-prefjs-surveyer.

Preference difference
PrefFirefox 130.0.1Firefox 131.0 beta 9
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.backup.scheduled.idle-threshold-seconds 300 15
browser.newtabpage.activity-stream.discoverystream.merino-provider.enabled false true
browser.newtabpage.activity-stream.discoverystream.topicLabels.enabled true false
browser.newtabpage.activity-stream.discoverystream.topicLabels.locale-topic-label-config undefined en-US, en-GB, en-CA
browser.newtabpage.activity-stream.discoverystream.topicLabels.region-topic-label-config undefined
browser.newtabpage.activity-stream.newtabLayouts.variant-a undefined false
browser.newtabpage.activity-stream.newtabLayouts.variant-b undefined false
browser.newtabpage.activity-stream.support.url https://support.mozilla.org/1/firefox/130.0.1/Linux/en-US/new-tab https://support.mozilla.org/1/firefox/131.0/Linux/en-US/new-tab
browser.safebrowsing.provider.mozilla.updateURL https://shavar.services.mozilla.com/downloads?client=SAFEBROWSING_ID&appver=%MAJOR_VERSION%&pver=2.2 moz-sbrs:://antitracking
browser.search.totalSearches undefined 0
browser.tabs.hoverPreview.enabled false true
browser.tabs.tabmanager.enabled true undefined
browser.translations.mostRecentTargetLanguages undefined
browser.urlbar.quicksuggest.ampTopPickCharThreshold undefined 0
devtools.client-side-throttling.enable false undefined
dom.cookie.testing.enabled undefined false
dom.fetchKeepalive.request_limit_per_origin undefined 10
dom.fetchKeepalive.total_request_limit undefined 30
dom.interactive_widget_default_resizes_visual undefined false
dom.performance.time_to_dom_content_flushed.enabled false undefined
dom.permissions.revoke.enable false undefined
dom.quotaManager.originOperations.pauseOnIOThreadMs undefined 0
dom.shadowdom.new_caretPositionFromPoint_behavior.enabled false true
dom.text_fragments.enabled false true
dom.viewTransitions.enabled undefined false
dom.workers.throttling.enabled undefined false
extensions.webcompat-reporter.enabled false true
geo.prompt.open_system_prefs undefined true
gfx.offscreencanvas.enabled true undefined
identity.fxaccounts.telemetry.clientAssociationPing.enabled false true
javascript.options.experimental.iterator_helpers undefined true
javascript.options.wasm_exnref false true
javascript.options.wasm_experimental_inline_call_ref_threshold undefined 1
layers.iosurfaceimage.use-nv12 true undefined
layout.css.inline-style-caching.always-enabled true undefined
layout.overflow-underflow.content.enabled true false
layout.overflow-underflow.content.enabled_in_addons true false
media.test.null.decoder.creation-failure undefined false
network.IDN.extra_allowed_chars undefined
network.IDN.extra_blocked_chars undefined
network.IDN.restriction_profile high undefined
network.compress.allow_truncated_empty_brotli true undefined
network.cookie.CHIPS.enabled false true
network.cookie.chips.partitionLimitEnabled false true
network.cookie.sameSite.noneRequiresSecure false true
network.http.microsoft-entra-sso.container-enabled.0 undefined true
network.http.microsoft-entra-sso.enabled undefined false
network.http.network_error_logging.enabled undefined false
network.idn.punycode_cyrillic_confusables undefined true
network.microsoft-sso-authority-list undefined login.microsoft.com, login.microsoftonline.com, sts.windows.net, login.partner.microsoftonline.cn, login.chinacloudapi.cn, login.microsoftonline.us, login-us.microsoftonline.com
network.send_OnDataFinished.cssLoader false true
permissions.media.query.enabled undefined false
permissions.media.show_always_ask.enabled undefined false
privacy.bounceTrackingProtection.enableDryRunMode true undefined
privacy.bounceTrackingProtection.enabled true undefined
privacy.bounceTrackingProtection.mode undefined 3
privacy.resistFingerprinting.autoDeclineNoUserInputCanvasPrompts true undefined
services.sync.prefs.sync.general.smoothScroll true undefined
svg.Moz2D.strokeBounds.enabled undefined false
svg.nearestAndFarthestViewportElement.enabled true false
toolkit.shopping.ohttpRelayURL https://mozilla-ohttp-fakespot.fastly-edge.com/ https://mozilla-ohttp.fastly-edge.com/
toolkit.telemetry.dap.helper.hpke undefined ACkAACAAAQABACAucqWdIQRN6BxumPBRXIlg2JsxcznwWX7vyqzM3cjuQA
toolkit.telemetry.dap.helper.url undefined https://dap.services.mozilla.com
toolkit.telemetry.dap.leader.hpke undefined ACkAACAAAQABACDk8wgwe2-TqHyaL74uqjVWMcF1zi9pxiwQhu4aPwncYw
toolkit.telemetry.dap.leader.url undefined https://dap-09-3.api.divviup.org
toolkit.telemetry.dap_helper https://dap.services.mozilla.com undefined
toolkit.telemetry.dap_helper_owner Mozilla undefined
toolkit.telemetry.dap_leader https://dap-09-3.api.divviup.org/ undefined
toolkit.telemetry.dap_leader_owner ISRG undefined
toolkit.telemetry.enabled false true
urlclassifier.blockedTable moztest-block-simple,mozplugin-block-digest256 moztest-block-simple
webextensions.storage.session.enforceQuota undefined false
widget.titlebar-x11-use-shape-mask false undefined