Yes; I have several modifications installed as modifications both to my local copy of Safari and to my Wikipedia account (I was experiencing this bug on the English WP.)  In Safari, I have the 'Duplicate Tab' Button 2.0, Print Plus 1.1.0.2, Middle-Click AutoScroll 1.04, TabLock 1.1, Search Preview 1.2.3, Tab Reloader 1.5.2, Session 1.3.0.2, Feedly 16.0.5.21, and Ultimate Status Bar 1.3 extensions installed and enabled and the Cuss Off 1.1, MacRumors Minimal 1.7, and Lazarus Form Recovery 3.2 extensions installed, but disabled.  The en:wp Gadgets that I have enabled in my preferences are, as listed on en:wp:Special:Gadgets, Gadget-searchFocus.js, Gadget-ImageAnnotator.js, Gadget-imagelinks.js, Gadget-popups.js/Gadget-navpops.css, Gadget-PrintOptions.js, Gadget-revisionjumper.js, Twinkle, Gadget-HideFundraisingNotice.js/Gadget-HideFundraisingBanner.css, Gadget-teahouse.js/Gadget-teahouse.css, Gadget-WatchlistChangesBold.js/Gadget-WatchlistChangesBold.css, Gadget-defaultsummaries.js, Gadget-citations.js, Gadget-HotCat.js, Gadget-wikEd.js, Gadget-afchelper.js, Gadget-DRN-wizard-loader.js, Gadget-edittop.js/Gadget-edittop.css, Gadget-UTCLiveClock.js, Gadget-mySandbox.js, Gadget-purgetab.js, Gadget-externalsearch.js, Gadget-dropdown-menus.js/Gadget-dropdown-menus.css, Gadget-CommentsInLocalTime.js, Gadget-NoSmallFonts.css, Gadget-metadata.js, Gadget-MenuTabsToggle.js/Gadget-MenuTabsToggle.css, Gadget-JustifyParagraphs.css, Gadget-righteditlinks.css, Gadget-PrettyLog.js/Gadget-PrettyLog.css, Gadget-SidebarTranslate.js/Gadget-SidebarTranslate.css, Gadget-widensearch.css, Gadget-DejaVu Sans.css, Gadget-contribsrange.js, Gadget-BugStatusUpdate.js, Gadget-RTRS.js, and Gadget-NewImageThumbs.js/Gadget-NewImageThumbs.css.  The beta features that I am using on en:wp are 'New search,' 'Media Viewer,' 'VisualEditor,' 'VisualEditor formulae editing,' and 'Compact language links.'  (Maybe I should open another new bug labeled as an 'enhancement' asking for users to have the ability to export their Gadget and Beta Features settings as a CSV file so that they don't have to type them all out when they need to submit them as pieces of technical information for help with bugs?)