Firefox Browser blocking Flash

Am using Firefox Version 11.0 and Flash Version 11.1. Get the following pop-up when accessing email.
Your browser is blocking Flash. You must have Flash 9.0 or higher installed and unblocked to run an openmail application. You can download and install the latest Flash Player
Doesn't appear to be a newer version of Flash available, so I'm not sure what I need to do to get rid of the pop-up.

Here's what happened: Last week, Adobe updated the way they report the Flash version (not Firefox version but the version of Flash) as part of a Flash update. It seems that Yahoo Mail didn't update their code to check correctly and so it looks like (to them) that Flash isn't working (they can see that you have it installed but the version check code doesn't work).
This needs to be fixed on the Yahoo side. In the meantime, you could try cor-el's suggestion to switch to classic view.

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    Sent: Wednesday, March 25, 2015 10:46 PM
    Subject:  I cannot install Adobe Flash Player.  I have windows 7 64bit and firefox browser.  During install i get a message 'lost connection', followed by 'trying to reconnect', and then connection failed
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