Screenshot of the error

When I clicked on the star to watch the page [[mw:Extension:EmbedSandbox]] I got the following error on Google Chrome 21.0.1180.89:

Uncaught TypeError: Object function (selector,context){return new jQuery.fn.init(selector,context,rootjQuery);} has no method 'parseHTML' bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=ext.flaggedRevs.advanced%2Creview%7Cext.gadget.WmfProjectStatusHelper%2Cenwp-boxes%7Cjquery.autoEllipsis%2CcheckboxShiftClick%2CcollapsibleTabs%2CdelayedBind%2ChighlightText%2CmakeCollapsible%2Cmw-jump%2Cplaceholder%2Csuggestions%2CtabIndex%7Cmediawiki.api%2Cuser%7Cmediawiki.api.watch%7Cmediawiki.legacy.mwsuggest%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax&skin=vector&version=20120908T025910Z&*:82
(anonymous function) bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=ext.flaggedRevs.advanced%2Creview%7Cext.gadget.WmfProjectStatusHelper%2Cenwp-boxes%7Cjquery.autoEllipsis%2CcheckboxShiftClick%2CcollapsibleTabs%2CdelayedBind%2ChighlightText%2CmakeCollapsible%2Cmw-jump%2Cplaceholder%2Csuggestions%2CtabIndex%7Cmediawiki.api%2Cuser%7Cmediawiki.api.watch%7Cmediawiki.legacy.mwsuggest%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax&skin=vector&version=20120908T025910Z&*:82
ok bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=ext.flaggedRevs.advanced%2Creview%7Cext.gadget.WmfProjectStatusHelper%2Cenwp-boxes%7Cjquery.autoEllipsis%2CcheckboxShiftClick%2CcollapsibleTabs%2CdelayedBind%2ChighlightText%2CmakeCollapsible%2Cmw-jump%2Cplaceholder%2Csuggestions%2CtabIndex%7Cmediawiki.api%2Cuser%7Cmediawiki.api.watch%7Cmediawiki.legacy.mwsuggest%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax&skin=vector&version=20120908T025910Z&*:59
jQuery.Callbacks.fire load.php:14
jQuery.Callbacks.self.fireWith load.php:15
jQuery.Callbacks.self.fire load.php:15
mw.Api.ajax bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=en&modules=ext.flaggedRevs.advanced%2Creview%7Cext.gadget.WmfProjectStatusHelper%2Cenwp-boxes%7Cjquery.autoEllipsis%2CcheckboxShiftClick%2CcollapsibleTabs%2CdelayedBind%2ChighlightText%2CmakeCollapsible%2Cmw-jump%2Cplaceholder%2Csuggestions%2CtabIndex%7Cmediawiki.api%2Cuser%7Cmediawiki.api.watch%7Cmediawiki.legacy.mwsuggest%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax&skin=vector&version=20120908T025910Z&*:55
jQuery.Callbacks.fire load.php:14
jQuery.Callbacks.self.fireWith load.php:15
done load.php:114
jQuery.ajaxTransport.send.callback load.php:124

Subsequent clicks on the star also caused the error, even after the page was reloaded (which, BTW I did to confirm that the page was indeed added to my watchlist despite the white star not changing to blue)

Version: unspecified
Severity: normal
URL: https://www.mediawiki.org/wiki/Extension:EmbedSandbox

Attached: