This is difference between the default preference of Firefox 107.0 beta 3 and one of 106.0.1. This diff table is generated with my small script firefox-prefjs-surveyer.

Preference difference
PrefFirefox 106.0.1Firefox 107.0 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
apz.scrollend-event.content.enabled undefined false
browser.cache.offline.enable true false
browser.firefox-view.feature-tour {"message":"FIREFOX_VIEW_FEATURE_TOUR","screen":"FIREFOX_VIEW_SPOTLIGHT","complete":false} {"screen":"FIREFOX_VIEW_SPOTLIGHT","complete":false}
browser.newtabpage.activity-stream.telemetry.ut.events false true
browser.pdfjs.feature-tour undefined {"message":"PDF_JS_FEATURE_TOUR","screen":"","complete":false}
browser.urlbar.quickactions.enabled undefined true
browser.urlbar.quickactions.showInZeroPrefix undefined true
browser.urlbar.quickactions.showPrefs undefined true
browser.urlbar.shortcuts.quickactions undefined true
browser.urlbar.suggest.quickactions undefined true
cookiebanners.service.mode.privateBrowsing undefined 0
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.media.webcodecs.enabled undefined false
dom.resize_observer.support_fragments undefined false
dom.user_activation.ignore_scrollbars undefined true
dom.webidl.crosscontext_hasinstance.enabled true false
dom.webmidi.enabled false true
editor.join_split_direction.compatible_with_the_other_browsers undefined false
editor.join_split_direction.force_use_compatible_direction undefined
editor.join_split_direction.force_use_traditional_direction undefined
extensions.InstallTrigger.enabled true false
extensions.formautofill.creditCards.heuristics.confidenceThreshold 0.5 undefined
extensions.formautofill.creditCards.heuristics.fathom.confidenceThreshold undefined 0.5
extensions.formautofill.creditCards.heuristics.fathom.highConfidenceThreshold undefined 0.95
extensions.formautofill.creditCards.heuristics.fathom.testConfidence undefined 0
extensions.formautofill.creditCards.heuristics.fathom.types undefined cc-number,cc-name
extensions.formautofill.creditCards.heuristics.nameExpirySection.enabled false undefined
extensions.formautofill.creditCards.heuristics.numberOnly.confidenceThreshold 0.95 undefined
extensions.manifestV3.enabled false true
extensions.webcompat-reporter.enabled false true
fission.processProfileName 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.font_rendering.colr_v1.enabled false true
gfx.webrender.wait-gpu-finished.disabled undefined false
html5.inert.enabled false true
layout.css.contain-intrinsic-size.enabled false true
layout.css.font-palette.enabled undefined true
layout.css.font-tech.enabled false true
layout.dynamic-reflow-roots.enabled false true
mathml.ms_lquote_rquote_attributes.disabled undefined true
media.peerconnection.sdp.disable_stereo_fmtp undefined false
media.webrtc.platformencoder.sw_mft false true
network.IDN.use_whitelist false undefined
network.IDN.whitelist.ac true undefined
network.IDN.whitelist.ar true undefined
network.IDN.whitelist.asia true undefined
network.IDN.whitelist.at true undefined
network.IDN.whitelist.biz true undefined
network.IDN.whitelist.br true undefined
network.IDN.whitelist.ca true undefined
network.IDN.whitelist.cat true undefined
network.IDN.whitelist.ch true undefined
network.IDN.whitelist.cl true undefined
network.IDN.whitelist.cn true undefined
network.IDN.whitelist.de true undefined
network.IDN.whitelist.dk true undefined
network.IDN.whitelist.ee true undefined
network.IDN.whitelist.es true undefined
network.IDN.whitelist.fi true undefined
network.IDN.whitelist.fr true undefined
network.IDN.whitelist.gr true undefined
network.IDN.whitelist.gt true undefined
network.IDN.whitelist.hu true undefined
network.IDN.whitelist.il true undefined
network.IDN.whitelist.info true undefined
network.IDN.whitelist.io true undefined
network.IDN.whitelist.ir true undefined
network.IDN.whitelist.is true undefined
network.IDN.whitelist.jp true undefined
network.IDN.whitelist.kr true undefined
network.IDN.whitelist.li true undefined
network.IDN.whitelist.lt true undefined
network.IDN.whitelist.lu true undefined
network.IDN.whitelist.lv true undefined
network.IDN.whitelist.museum true undefined
network.IDN.whitelist.no true undefined
network.IDN.whitelist.nu true undefined
network.IDN.whitelist.nz true undefined
network.IDN.whitelist.org true undefined
network.IDN.whitelist.pl true undefined
network.IDN.whitelist.pm true undefined
network.IDN.whitelist.pr true undefined
network.IDN.whitelist.re true undefined
network.IDN.whitelist.se true undefined
network.IDN.whitelist.sh true undefined
network.IDN.whitelist.si true undefined
network.IDN.whitelist.tel true undefined
network.IDN.whitelist.tf true undefined
network.IDN.whitelist.th true undefined
network.IDN.whitelist.tm true undefined
network.IDN.whitelist.tw true undefined
network.IDN.whitelist.ua true undefined
network.IDN.whitelist.vn true undefined
network.IDN.whitelist.wf true undefined
network.IDN.whitelist.xn--0zwm56d true undefined
network.IDN.whitelist.xn--11b5bs3a9aj6g true undefined
network.IDN.whitelist.xn--80akhbyknj4f true undefined
network.IDN.whitelist.xn--90a3ac true undefined
network.IDN.whitelist.xn--9t4b11yi5a true undefined
network.IDN.whitelist.xn--deba0ad true undefined
network.IDN.whitelist.xn--fiqs8s true undefined
network.IDN.whitelist.xn--fiqz9s true undefined
network.IDN.whitelist.xn--fzc2c9e2c true undefined
network.IDN.whitelist.xn--g6w251d true undefined
network.IDN.whitelist.xn--hgbk6aj7f53bba true undefined
network.IDN.whitelist.xn--hlcj6aya9esc7a true undefined
network.IDN.whitelist.xn--j6w193g true undefined
network.IDN.whitelist.xn--jxalpdlp true undefined
network.IDN.whitelist.xn--kgbechtv true undefined
network.IDN.whitelist.xn--kprw13d true undefined
network.IDN.whitelist.xn--kpry57d true undefined
network.IDN.whitelist.xn--mgba3a4f16a true undefined
network.IDN.whitelist.xn--mgba3a4fra true undefined
network.IDN.whitelist.xn--mgbaam7a8h true undefined
network.IDN.whitelist.xn--mgbayh7gpa true undefined
network.IDN.whitelist.xn--mgberp4a5d4a87g true undefined
network.IDN.whitelist.xn--mgberp4a5d4ar true undefined
network.IDN.whitelist.xn--mgbqly7c0a67fbc true undefined
network.IDN.whitelist.xn--mgbqly7cvafr true undefined
network.IDN.whitelist.xn--o3cw4h true undefined
network.IDN.whitelist.xn--ogbpf8fl true undefined
network.IDN.whitelist.xn--p1ai true undefined
network.IDN.whitelist.xn--wgbh1c true undefined
network.IDN.whitelist.xn--wgbl6a true undefined
network.IDN.whitelist.xn--xkc2al3hye2a true undefined
network.IDN.whitelist.xn--zckzah true undefined
network.IDN.whitelist.yt true undefined
network.cache.frecency_array_check_enabled false true
network.cookie.sameSite.laxByDefault false true
network.cookie.sameSite.noneRequiresSecure false true
network.http.http3.version_negotiation.enabled undefined false
network.http.remove_resumption_token_when_early_data_failed undefined true
network.jar.record_failure_reason false true
network.predictor.enable-prefetch false true
network.proxy.retry_failed_proxies undefined true
network.ssl_tokens_cache_enabled true undefined
network.ssl_tokens_cache_records_per_entry undefined 2
network.ssl_tokens_cache_use_only_once undefined false
privacy.annotate_channels.strict_list.enabled false true
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
services.sync.engine.bookmarks.validation.enabled undefined true
services.sync.engine.passwords.validation.enabled undefined true
services.sync.prefs.sync.browser.pdfjs.feature-tour undefined true
toolkit.telemetry.enabled false true
webgl.out-of-process.async-present false true