If you notice that page elements are missing from browser to browser with no obvious source, verify that AdBlock is installed and then check that the offending element does not meet the criteria of being an advertisement.  Here is a list of the classes, IDs, and various other selectors that AdBlock currently looks for:

#advert1,
#advert2,
#advertise,
#advertisement1,
#advertisetop,
#advertising_wrapper,
#advtop,
#adwrapper,
#banner-ad,
#bannerAd,
#bannerAdWrapper,
#banner_topad,
#bannerad,
#bigAd,
#bigad,
#body_ad,
#bottom_ad,
#centerads,
#cmn_ad_tag_head,
#companionAd,
#content-header-ad,
#contentAd,
#content_ads,
#content_adv,
#contentad,
#dart-container-728x90,
#dfp_ad_Entry_728x90,
#dfp_ad_Home_728x90,
#divAd,
#div_prerollAd_1,
#download_ad,
#featuread,
#featured-ads,
#featuredAds,
#footer_ad,
#footer_ads,
#game-ad,
#google_ads_frame,
#google_ads_frame1_anchor,
#google_ads_frame2,
#googlead,
#head-ad,
#header-ads,
#headerAd,
#headerAdContainer,
#header_ad,
#homead,
#ka_adRightSkyscraperWide,
#leaderAd,
#leaderBoardAd,
#leaderboard-ad,
#left_ads,
#leftad,
#leftads,
#logoAd,
#logo_ad,
#mainAd,
#main_ad,
#mpu2,
#mpu2_container,
#mpu_container,
#msad,
#myAd,
#player_ads,
#pre_advertising_wrapper,
#prerollAd,
#promo-ad,
#publicidad,
#reklama,
#rh-ad,
#right_ads,
#right_adsense,
#searchAd,
#search_ads,
#sideAd,
#side_ads,
#sidebar-ads,
#sidebar_ads,
#skybox-ad,
#sponsorAdDiv,
#sponsoredlinks,
#sponsors-home,
#takeover_ad,
#top-ad,
#topAd,
#topAdSpace,
#topAdSpace_div,
#topAdvert,
#topBannerAd,
#top_ad,
#top_ads,
#topad,
#topbannerad,
#videoAd,
.ADBAR,
.AdBody:not(body),
.AdBox,
.AdInfo,
.AdTitle,
.AdvertContainer,
.HomeAds,
.RelatedAds,
.SponsoredContent,
.ad-300x250,
.ad-banner,
.ad-block,
.ad-border,
.ad-btn,
.ad-button,
.ad-cell,
.ad-display,
.ad-enabled,
.ad-holder,
.ad-img,
.ad-inner,
.ad-item,
.ad-leader,
.ad-leaderboard,
.ad-left,
.ad-links,
.ad-right,
.ad-section,
.ad-served,
.ad-sidebar,
.ad-square,
.ad-stack,
.ad-text,
.ad-top,
.ad-unit,
.ad-unit-300-wrapper,
.ad-vertical-container,
.ad-wide,
.ad-wrap,
.ad-wrapper,
.ad160,
.ad300,
.ad728,
.ad90,
.adBlock,
.adBottomBoard,
.adBox,
.adContent,
.adDiv,
.adElement,
.adFrame,
.adFrameCnt,
.adHead,
.adHeader,
.adHeaderblack,
.adHeadline,
.adHolder,
.adHoldert,
.adImg,
.adItem,
.adLink,
.adMiddle,
.adMod,
.adModule,
.adOverlay,
.adPanel,
.adResult,
.adRight,
.adRotator,
.adSpace,
.adSpot,
.adText,
.adTitle,
.adTopHome,
.adWidget,
.adWrap,
.ad_1,
.ad_160,
.ad_160x600,
.ad_2,
.ad_3,
.ad_728x90,
.ad_Right,
.ad_body,
.ad_container,
.ad_description,
.ad_global_header,
.ad_head_rectangle,
.ad_header,
.ad_item,
.ad_leaderboard,
.ad_line,
.ad_middle,
.ad_outer,
.ad_promo,
.ad_slug_table,
.ad_space,
.ad_text,
.ad_title,
.ad_trick_header,
.ad_wrap,
.ad_wrapper,
.ad_zone,
.adarea,
.adbanner,
.adbar,
.adbottom,
.adbutton,
.adcolumn,
.adcont,
.addiv,
.adframe,
.adheader,
.adholder,
.adinfo,
.adlink,
.adlist,
.admain,
.admiddle,
.adright,
.adrow1,
.adrow2,
.ads-area,
.ads-col,
.ads-header,
.ads-holder,
.ads-inline,
.ads-item,
.ads-section,
.ads-title,
.ads-top,
.ads1,
.adsBlock,
.ads_catDiv,
.ads_div,
.ads_top,
.ads_wrapper,
.adsbottombox,
.adsbox,
.adsbygoogle,
.adscontainer,
.adshome,
.adside,
.adslot_blurred,
.adspace,
.adtile,
.adtop,
.adv_300,
.advert-block,
.advert-box,
.advert-container,
.advert-content,
.advert-horizontal,
.advert2,
.advertColumn,
.advertContainer,
.advertLink,
.advertText,
.advert_container,
.advert_list,
.advertbox,
.advertisement-1,
.advertisement-swimlane,
.advertiser,
.advertising_block,
.advertisment,
.advertorial,
.adverts,
.adverttext,
.adwords,
.afs_ads,
.after-post-ad,
.article_ad,
.banner-ads,
.banner300,
.bannerAd,
.banner_728x90,
.banner_ad,
.bannerad,
.block-ad,
.blog-ads,
.bottom-ad,
.bottom-ads,
.bottom-left-ad,
.bottomAds,
.bottom_ad_block,
.box-ads,
.boxad,
.can_ad_slug,
.category-ad,
.change_AdContainer,
.container_ad,
.container_row_ad,
.contentAd,
.content_ads,
.cp-adsInited,
.displayAd,
.featuredAdBox,
.flash-advertisement,
.footer-ad,
.footer-ads,
.footerad,
.forumAd,
.gallery-ad,
.google-sponsored,
.googleAdSense,
.googleAds,
.header-ad,
.headerAd,
.header_ad,
.header_ad_center,
.header_advert,
.headerad,
.headerads,
.home-ad,
.homeAd,
.homead,
.homepage-ad,
.homepage_ads,
.horizontal_ad,
.image-advertisement,
.imgad,
.inner_ad,
.innerad,
.interstitial_ad_wrapper,
.ipsAd,
.item-container-ad,
.leaderboard-ad,
.leaderboard-ads,
.leftAd,
.leftad,
.list-ad,
.logo-ad,
.marketing-ad,
.mid_ad,
.middle_AD,
.module-ad,
.newsAd,
.oasad,
.openx,
.page_ad,
.pfAd,
.player_ad,
.player_hover_ad,
.pm-ad,
.post-ad,
.post_ad,
.post_ads,
.postad,
.premiumAdOverlay,
.premiumAdOverlayClose,
.promoAd,
.publicidad,
.rbRectAd,
.rectangle_ad,
.refreshAds,
.region-top-ad-position,
.reklam,
.reklama,
.reportAdLink,
.right-ad,
.rightAd,
.right_ad,
.right_ads_column,
.rightad,
.rightadv,
.sb_adsNv2,
.searchAds,
.searchad,
.searchads,
.showAd,
.side-ad,
.side-bar-ad-position1,
.single-ad,
.singleAd,
.sky_ad,
.skyscraperAd,
.smallAd,
.small_ad,
.smallads,
.sponsor-box,
.sponsoredLinks,
.sponsorlink,
.text-ad,
.textad,
.textads,
.top-ad,
.topAds,
.top_ad,
.top_ad_div,
.top_ad_wrap,
.top_ads,
.topads,
.tower-ad,
.type_ads_default,
.wideAd,
.withAds,
.wp_bannerize,
.yom-ad,
a[href^="http://ad-emea.doubleclick.net/"],
a[href^="http://ad.doubleclick.net/"],
a[href^="http://adultfriendfinder.com/p/register.cgi?pid="],
a[href^="http://marketgid.com"],
a[href^="http://mgid.com/"],
a[href^="http://pubads.g.doubleclick.net/"],
a[href^="http://us.marketgid.com"],
a[href^="http://www.fbooksluts.com/"],
a[href^="http://www.fleshlight.com/"],
a[href^="http://www.google.com/aclk?"],
a[href^="http://www.liutilities.com/"],
a[href^="http://www.socialsex.com/"],
a[href^="http://www.yourfuckbook.com/?"],
a[id^="mg_add"],
div[id^="MarketGid"],
div[id^="div-gpt-ad-"],
iframe[src^="http://ad.yieldmanager.com/"]
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