Back in the day Flash was a necessary evil, horrendous to program professionally but was capable of dealing with client side functionality such as videos and animation that the browsers at the time simply could not.
It'll be nice to see a rush of websites hopefully updating to html5.
Adobe's Flash software is now blocked by default on all versions of the Firefox web browser. Mozilla, which develops Firefox, imposed the block because recently unearthed bugs in Flash were being actively used by cyber-thieves. The bugs were detailed in a cache of documents stolen from security firm Hacking Team that was hit by attackers last week. Adobe said it took Flash's security "seriously" and was planning bug fixes. Flash is widely used on many websites for both multimedia and interactive elements.