▁ ▁This ▁problem ▁increased ▁during ▁the ▁mid - 1 9 9 0 s ▁as ▁resource - h un gry ▁multimedia ▁techn ologies ▁such ▁as ▁Quick Time ▁were ▁installed ▁as ▁extensions . ▁In ▁addition , ▁a ▁number ▁of ▁applications , ▁especially ▁Microsoft ▁Office , ▁required ▁a ▁large ▁number ▁of ▁extensions . ▁Many ▁Mac int osh ▁users ▁had ▁hundreds ▁of ▁extensions ▁running ▁on ▁their ▁systems , ▁all ▁of ▁varying ▁age ▁and ▁quality . ▁Bug gy , ▁dam aged ▁and ▁out dated ▁extensions ▁were ▁the ▁most ▁common ▁cause ▁of ▁problems . ▁Some ▁users ▁had ▁to ▁remember ▁to ▁turn ▁off ▁problem atic ▁extensions ▁when ▁running ▁certain ▁programs . ▁ ▁Later ▁versions ▁of ▁System ▁ 7 ▁included ▁the ▁Ext ensions ▁Manager , ▁which ▁allowed ▁users ▁to ▁turn ▁off ▁specific ▁extensions ▁or ▁groups ▁of ▁extensions ▁at ▁startup ▁when ▁troubles ho oting ▁the ▁conflict ▁by ▁pressing ▁the ▁Space bar ▁while ▁the ▁computer ▁bo ots . ▁This ▁tool ▁was ▁also ▁accessible ▁by ▁heading ▁to ▁the ▁Ext ensions ▁panel ▁in ▁the ▁Control ▁Pan els ▁found ▁in ▁the ▁Apple ▁menu . ▁Conf lict ▁C atch er , ▁a ▁third ▁party ▁utility , ▁automatically ▁detected ▁conflicts ▁and ▁problem atic ▁extensions , ▁otherwise ▁a ▁time - consum ing ▁task ▁that ▁required ▁users ▁to ▁turn ▁off ▁extensions ▁in ▁sets ▁until ▁they ▁found ▁the ▁conflict . ▁Ext ensions ▁were ▁only ▁loaded ▁at ▁startup ▁time , ▁meaning ▁that ▁any ▁attempted ▁change ▁required ▁a ▁reboot . ▁ ▁The ▁most ▁common ▁time ▁for ▁extension ▁conflicts ▁to ▁start ▁was ▁the ▁release ▁of ▁a ▁new ▁version ▁of ▁the ▁operating ▁system , ▁followed