browser directing to yahoo search

in my firefox sometime when i try to visit any site say it automatically directs me to yahoo search.
it happens randomly but when this happens i cannot open any site by typing url because it directs me to yahoo search.
i found one way to avoid it. i restart firefox with add-ons disabled and it starts in safe mode and the problem disappears.
but i have to do it everytime.
is there any permanent way to get rid of this ?
Rohit BajajAsked:
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Check your Firefox add-ons, extensions and plug-ins and disable or remove everything to do with Yahoo.
Steven CarnahanNetwork ManagerCommented:
This sounds like a redirect virus. Without more specifics I think it's easier to just point you to a site that covers all OS's to remove it.

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Thomas Zucker-ScharffSolution GuideCommented:
Firefox upgraded and auto changed everyone's search provider to yahoo. You need to change the default search provider to Google.
David Johnson, CD, MVPOwnerCommented:
Firefox search providers
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