Due to a confessed vulnerability in Adobe's current version, Mozilla has soft-blocked the latest version of the Shockwave Flash plugin. Therefore, you need to activate it on sites you trust to use it instead of being able to set Firefox to let all sites use Flash automatically.

If you are not accustomed to using the "Ask to Activate" feature for a plugin, here's what to expect:

When you visit a site that wants to use the Flash, you should see a notification icon in the address bar and one of the following: a link in a black rectangle in the page or an infobar sliding down between the toolbar area and the page.

If you see a good reason to use Flash, and the site looks trustworthy, you can go ahead and click the Lego-like icon in the address bar to allow Flash.

But the page might be using Flash only for tracking or playing a video ad. If you don't see an immediate need for Flash, feel free to ignore the notification, it will just sit there in case you want it later.

The version I have is listed as a updated version for the issue, why would Mozilla still block it? https://helpx.adobe.com/security/products/flash-player/apsb15-16.html

New problems in the past few days:

https://helpx.adobe.com/security/products/flash-player/apsa15-04.html

Fixes are expected later this week.