Youtube not dispaying properly since yesterday - ok in google chrome - have latest java & flash player

when i open a youtube video page i get several lines of text display at the top. This isn't the text normally displayed by youtube.The actual video window appears as a small black square and beneath this is the video title. The video doesn't play. This started happening yesterday, after i downloaded a file unlocker and the browser got hijacked by funmoods! i've since got rid of this but now youtube won't work.
i have since downloaded the latest version of firefox, adobe flash player and java but it has made no difference. i can send you a screen print (t won't paste in here)
it works fine in google chrome (which also got hijacked by funmoods, since sorted).

Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
*Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do not click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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