The Manifesto: Flash Player is dead. Its time has passed. It's buggy. It crashes a lot. It requires constant security updates. It doesn't work on most mobile devices. It's a fossil, left over from the era of closed standards and unilateral corporate control of web technology. Websites that rely on Flash present a completely inconsistent (and often unusable) experience for fast-growing percentage of the users who don't use a desktop browser. It introduces some scary security and privacy issues by way of Flash cookies.
But wait, I know that many of you gentle readers are on the other side of this argument and are not about to uninstall your Flash plugin. There's a movement for you too. It's called Occupy HTML.
It's Manifesto: Flash is mature. It's supported by all major desktop browsers. It's stable when used properly. If not, it crashes a lot, just like every other technology. It requires constant security updates, just like every other web technology. It doesn't work well on most mobile devices, and for good reasons. It's a content plugin, developed during the era of closed standards and unilateral corporate control of web technology. Websites that rely on Flash can present a unique (and often unparalleled) experience for the massive percentage of users on a desktop browser. Flash powers some amazing experiences that work consistently across all of the major browsers in a way that cannot be replicated without Flash technology.
Before you get too worked up... this is intended to be humorous.