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Firefox Plugin Activation Deadline March 31, 2014
After much testing and iteration, we determined that Firefox would no longer activate most plugins by default and instead opted to let people choose when to enable plugins on sites they visit. We call this feature in Firefox click-to-play plugins.
We strongly encourage site authors to phase out their use of plugins. The power of the Web itself, especially with new technologies like emscripten and asm.js, make plugins much less essential than they once were. Plus, plugins present real costs to Firefox users. Though people may not always realize it, we know plugins are a significant source of poor performance, crashes and security vulnerabilities.Firefox Plugin Activation Deadline March 31, 2014 [blog.mozilla.org]
Today marks the beginning of an application window that will run until March 31, 2014. Any plugin author’s application received before the deadline will be reviewed and processed before click-to-play is activated by default in Firefox. Whitelisted status will be granted for four consecutive Firefox releases and authors may reapply for continued exemption as the end of the grace period draws near.
Firefox seems hell bent on getting rid of their loyal user base
Now they're being told "We're sorry, but you should just go out of business"
for instance if this gets in the way of people using Firefox and Youtube
Personally, on linux, I view flash about once every few months.