Upgrade to 10.9.4 messed up yahoo email on firefox

I have a new macbook pro that came with system 10.9.3. About one week ago I upgraded to 10.9.4 and now my yahoo email in firefox changed from little boxes to numbers. I will post a screen shot picture below.
My macbook pro is a standard with 500 gigs of ram and 8 gigs of ram.
Is anyone else having this problem or does anyone know how to fix it? My email on my 2010 iMac (system 10.6.8) viewed on firefox is fine.
Thanks,
Martha

Thanks Davis, yes necessary question, although yesterday I was away from any accessible connection other than my iphone's so I could not answer right away.
So I went to a McDo... and saw the same behaviour. Then, having simultaneous access to internet through their Wifi & my phone (internet sharing is blocked during phone conversations), I could call Applecare...
Took them some time (and technical escalation) to figure out some application in the background (possibly confused by the OS upgrade) could be blocking the mail app in its attempts to connect to the mail servers.
Resolution went as follows:
1- reboot in "pure" or "no failure" mode, i.e., without any extension started (boot with Shift key pressed -- I didn't know about that)
2- see that mail app is now working (relief++ ;-)
3- suppress any application not obviously needed (of which one was a poor CRM software I bought and then had trouble remove a year ago and forgot about... as it had a mail plug-in, it might be the culprit... anyway I trashed it along with a couple other unneeded applications)
4- reboot in normal mode
=> see mail working
As always it looks easy once resolved. As no parameter was changed, and seeing all connection attempts failing at mail app level (but not in, say, safari), it was clear that the mail app itself was malfunctioning. Yet, the upgrade was not supposed to directly interact with mail. The catch was then the plug-in or any other software possibly using shared mail services...
As we removed a handful of applications, I will not name the supposed culprit, although I think it was the only likely candidate (as the others were at least in apparence very inoffensive -- such as a file conversion utility -- but who knows ;-)
Cheers
Vincent

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Upgrade to 10.9.4 messed up yahoo email on firefox

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