Why does Firefox not work here in China anymore, since January of 2015?

I have used Firefox for years, as the fastest and most reliable browser for me, esp in China... not anymore! Last month (unknown to me) a hijacker called Vosteran took over my Firefox browser. I finally realized it and got it cleaned up using Malwarebytes anti-malware, and downloaded a new Firefox... now SAME problem exists, even with Vosteran removed!
Firefox will not allow me into ANY normal sites, saying they don't have the proper security code. This includes my Yahoo front page, email account, ESPN and other common sites that are certainly NOT dangerous. So, WHY does Firefox not work anymore? It is useless to me here in China the way it works now.

hello rickinchina, first please make sure that the '''date, time & timezone''' are set correctly on your system and that firefox is set to directly connect to the internet (that's the "'''no proxy'''" setting in the firefox ''menu ≡ > options > advanced > network > connection - settings...'').
if this doesn't solve the issue (or it is already set properly), a possible solution depends on different factors:
* what is the '''error code''' shown under ''technical details'' on the error page?
in case the error code equals ''sec_error_unknown_issuer'', please attempt to add an exception on the bottom of the error page (but don't do it for real) and inspect the certificate (see the screenshot attached for instructions):
* which '''issuer information''' does the certificate contain?
please report back with those two pieces of information. thank you!

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