This is difference between the default preference of Firefox 33.0 beta 3 and one of 32.0.

Default pref Javascript files (Firefox 32.0 for Linux x86_64):
(omni.ja){/greprefs.js,/defaults/pref/services-sync.js}, (browser/omni.ja)/defaults/preferences/{firefox.js,firefox-branding.js,firefox-l10n.js}, (webapprt/omni.ja)/defaults/preferences/prefs.js
Default pref Javascript files (Firefox 33.0 beta 3 for Linux x86_64):
(omni.ja){/greprefs.js,/defaults/pref/services-sync.js}, (browser/omni.ja)/defaults/preferences/{firefox.js,firefox-branding.js,firefox-l10n.js}, (webapprt/omni.ja)/defaults/preferences/prefs.js
PrefFirefox 32.0Firefox 33.0 beta 4
browser.cache.disk.free_space_hard_limitundefined1024
browser.cache.disk.free_space_soft_limitundefined5120
browser.cache.disk.max_chunks_memory_usageundefined10240
browser.cache.disk.max_priority_chunks_memory_usageundefined10240
browser.fixup.domainwhitelist.localhostundefinedtrue
browser.newtabpage.columns35
browser.newtabpage.directory.pingundefinedhttps://tiles.services.mozilla.com/v2/links/
browser.newtabpage.directory.sourcedata:application/json,{}https://tiles.services.mozilla.com/v2/links/fetch
browser.newtabpage.introShownundefinedfalse
browser.slowStartup.timeThreshold4500040000
browser.trackingprotection.gethashURLundefinedhttps://tracking.services.mozilla.com/gethash?client=SAFEBROWSING_ID&appver=%VERSION%&pver=2.2
browser.trackingprotection.updateURLundefinedhttps://tracking.services.mozilla.com/downloads?client=SAFEBROWSING_ID&appver=%VERSION%&pver=2.2
datareporting.healthreport.service.providerCategorieshealthreport-js-provider-defaulthealthreport-js-provider-default,healthreport-js-provider-beta
devtools.cache.disabledundefinedfalse
devtools.debugger.auto-black-boxundefinedtrue
devtools.discovery.logundefinedfalse
devtools.editor.autocompleteundefinedtrue
devtools.gcli.jquerySrcundefinedhttp://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js
devtools.gcli.lodashSrcundefinedhttp://cdnjs.cloudflare.com/ajax/libs/lodash.js/2.4.1/lodash.min.js
devtools.gcli.underscoreSrcundefinedhttp://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.6.0/underscore-min.js
devtools.remote.wifi.scanundefinedfalse
devtools.styleeditor.mediaSidebarWidthundefined238
devtools.styleeditor.navSidebarWidthundefined245
devtools.styleeditor.showMediaSidebarfalsetrue
dom.compartment_per_addonundefinedfalse
dom.cycle_collector.incrementalfalsetrue
dom.image.picture.enabledundefinedfalse
dom.mapped_arraybuffer.enabledundefinedfalse
dom.mozApps.debugundefinedfalse
extensions.blocklist.itemURLhttps://addons.mozilla.org/%LOCALE%/%APP%/blocked/%blockID%https://blocklist.addons.mozilla.org/%LOCALE%/%APP%/blocked/%blockID%
extensions.blocklist.urlhttps://addons.mozilla.org/blocklist/3/%APP_ID%/%APP_VERSION%/%PRODUCT%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/%OS_VERSION%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/%PING_COUNT%/%TOTAL_PING_COUNT%/%DAYS_SINCE_LAST_PING%/https://blocklist.addons.mozilla.org/blocklist/3/%APP_ID%/%APP_VERSION%/%PRODUCT%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/%OS_VERSION%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/%PING_COUNT%/%TOTAL_PING_COUNT%/%DAYS_SINCE_LAST_PING%/
gfx.font_rendering.harfbuzz.scripts255undefined
gfx.perf-warnings.enabledundefinedfalse
javascript.options.ion.offthread_compilationundefinedtrue
javascript.options.ion.parallel_compilationtrueundefined
javascript.options.mem.gc_max_empty_chunk_countundefined30
javascript.options.mem.gc_min_empty_chunk_countundefined1
layers.async-video-oop.enabledundefinedtrue
layout.css.DOMMatrix.enabledundefinedtrue
layout.css.outline-style-auto.enabledundefinedfalse
loop.debug.websocketundefinedfalse
loop.do_not_disturbundefinedfalse
loop.enabledundefinedtrue
loop.retry_delay.limitundefined300000
loop.retry_delay.startundefined60000
loop.ringtoneundefinedchrome://browser/content/loop/shared/sounds/Firefox-Long.ogg
loop.seenToSundefinedunseen
loop.serverundefinedhttps://loop.services.mozilla.com
media.getusermedia.browser.enabledundefinedtrue
media.getusermedia.screensharing.allowed_domainsundefined
media.getusermedia.screensharing.enabledundefinedtrue
media.gmp-gmpopenh264.provider.enabledundefinedtrue
media.gmp-manager.cert.checkAttributesundefinedtrue
media.gmp-manager.cert.requireBuiltInundefinedtrue
media.gmp-manager.certs.1.commonNameundefinedaus4.mozilla.org
media.gmp-manager.certs.1.issuerNameundefinedCN=DigiCert Secure Server CA,O=DigiCert Inc,C=US
media.gmp-manager.certs.2.commonNameundefinedaus4.mozilla.org
media.gmp-manager.certs.2.issuerNameundefinedCN=Thawte SSL CA,O="Thawte, Inc.",C=US
media.gmp-manager.logundefinedfalse
media.gmp-manager.urlundefinedhttps://aus4.mozilla.org/update/3/GMP/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/%OS_VERSION%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/update.xml
media.navigator.video.h264.levelundefined31
media.navigator.video.h264.max_brundefined0
media.navigator.video.h264.max_mbpsundefined0
media.peerconnection.video.h264_enabledundefinedfalse
media.tabstreaming.height240undefined
media.tabstreaming.time_per_frame40undefined
media.tabstreaming.width320undefined
media.track.enabledundefinedfalse
network.http.prompt-temp-redirecttruefalse
network.proxy.proxy_over_tlsfalsetrue
plugin.allowed_typesapplication/x-shockwave-flash,application/futuresplash
plugins.hide_infobar_for_blocked_pluginfalseundefined
plugins.hide_infobar_for_outdated_pluginfalseundefined
privacy.trackingprotection.enabledundefinedfalse
security.csp.newbackend.enablefalsetrue
security.csp.speccomplianttrueundefined
security.ssl3.dhe_dss_aes_256_shatruefalse
security.ssl3.dhe_dss_camellia_128_shafalseundefined
security.ssl3.dhe_dss_camellia_256_shafalseundefined
security.ssl3.dhe_rsa_camellia_128_shatruefalse
security.ssl3.dhe_rsa_camellia_256_shatruefalse
security.ssl3.dhe_rsa_des_ede3_shatruefalse
security.ssl3.ecdhe_rsa_des_ede3_shatruefalse
security.ssl3.rsa_camellia_128_shatruefalse
security.ssl3.rsa_camellia_256_shatruefalse
security.ssl3.rsa_fips_des_ede3_shafalseundefined
security.ssl3.rsa_seed_shafalseundefined
security.use_mozillapkix_verificationtrueundefined
services.push.serverURLundefinedwss://push.services.mozilla.com/
social.manifest.facebook{"origin":"https://www.facebook.com","name":"Facebook Share","shareURL":"https://www.facebook.com/sharer/sharer.php?u=%{url}","iconURL":"data:image/x-icon;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8%2F9hAAAAX0lEQVQ4jWP4%2F%2F8%2FAyUYTFhHzjgDxP9JxGeQDSBVMxgTbUBCxer%2Fr999%2BQ8DJBuArJksA9A10s8AXIBoA0B%2BR%2FY%2FjD%2BEwoBoA1yT5v3PbdmCE8MAshhID%2FUMoDgzUYIBj0Cgi7ar4coAAAAASUVORK5CYII%3D","icon32URL":"data:image/png;base64,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", "icon64URL":"data:image/png;base64,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", "description":"Easily share the web to your Facebook friends.","author":"Facebook","homepageURL":"https://www.facebook.com","builtin":"true","version":1}undefined
social.whitelisthttps://mozsocial.cliqz.com,https://now.msn.com,https://mixi.jphttps://mozsocial.cliqz.com
urlclassifier.disallow_completionstest-malware-simple,test-phish-simple,goog-downloadwhite-digest256test-malware-simple,test-phish-simple,goog-downloadwhite-digest256,mozpub-track-digest256
urlclassifier.malwareTableundefinedgoog-malware-shavar,test-malware-simple
urlclassifier.malware_tablegoog-malware-shavar,test-malware-simpleundefined
urlclassifier.phishTableundefinedgoog-phish-shavar,test-phish-simple
urlclassifier.phish_tablegoog-phish-shavar,test-phish-simpleundefined
urlclassifier.trackingTableundefinedmozpub-track-digest256
webapprt.app_update_intervalundefined86400
webgl.lose-context-on-heap-minimizefalseundefined
webgl.lose-context-on-memory-preasureundefinedfalse
webgl.restore-context-when-visibleundefinedtrue