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My startpage has been replaced with http://search.snapdo.com/?st=ds&q=www.google.com what steps do I need to take to remedy this and secure ff please?

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Yesterday the url kept vanishing in the url bar and now today something (possibly AVG?) is trying to get me to use their search engine: My startpage has been replaced with http://search.snapdo.com/?st=ds&q=www.google.com Also, weirdly, freeflvconverting.com has been coming up in my noscript list for *tons* of sites, even Mozilla so something fishy is going on.

Please can you advise me?

Yesterday the url kept vanishing in the url bar and now today something (possibly AVG?) is trying to get me to use their search engine: My startpage has been replaced with http://search.snapdo.com/?st=ds&q=www.google.com Also, weirdly, freeflvconverting.com has been coming up in my noscript list for *tons* of sites, even Mozilla so something fishy is going on. Please can you advise me?

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The snapdo problem has been addressed before. You can find the solutions in this thread:

https://support.mozilla.org/en-US/questions/937750?esab=a&s=snap.do&r=0&as=s