Like everything, when used for what it's intended, it's the best tool for the job.
Despite what Apple would have you believe, there's nothing actually wrong with Flash.
A simple Google search throws up all the problems
https://www.google.co.uk/search?q=a...firefox-b&gfe_rd=cr&ei=dHheV4-iK6ON8Qfw-pCoCw
Only Apple? Even Google has pulled the plug on Flash support too.
Yes they can, html5 is not a plugin. Flash heavy sites make most browsers crash or grind to a near standstill.