Firefox opens as clear window in W7 64bit; same in safe-mode - how do I fix that?

W7 64bit Firefox suddenly started opening as a clear window, only a red cross top right hand corner. Tried re-downloadiing and reinstalling and same issue.
Tried running in safe mode
Have restarted computer
Can run Google Chrome (don't want to use IE so quickly got chrome) without any issues and have not changed anything on the computer before it stopped working or after.
Last windows updates were over a week ago and firefox was working fine after that.
I have just recently done a AV scan with threats removed but again Firefox was working after that and after many shutdown/restarts after that.
A week prior to this issue I edited start up via MSCONFIG to stop some unwanted programs running at startup - again, many restarts and shutdowns since then with Firefox working successfully each day.

[https://support.mozilla.org/en-US/questions/940393#answer-377118 from another user] we found out that this might be related to malware active on your pc. please close all firefox windows and try [[Troubleshoot Firefox issues using Safe Mode|running firefox in safemode]] (by pressing the shift key while you're starting it). in firefox safemode go to firefox > addons > extensions and remove the entry named "Codec v1.0" or any other addons that look suspicious & you have not installed intentionally. afterwards see if you can run firefox normally again...
please also do an in-depth scan of your system with the security software already in place and/or a different tool like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] & keep firefox and your plugins up-to-date in order to stay safe on the web.
[[Troubleshoot Firefox issues caused by malware]]
[[Update Firefox to the latest version]]
https://www.mozilla.org/plugincheck/

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