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i want to set google search when i open firefox but it opening yahoo .com

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when i am opening firefox it open yahoo.com but i want google search , last some days it opening google but from now its opening yahoo.com, I try to set google search but i am failed what to do

when i am opening firefox it open yahoo.com but i want google search , last some days it opening google but from now its opening yahoo.com, I try to set google search but i am failed what to do

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Set whatever webpage you want as your homepage. https://support.mozilla.org/en-US/kb/how-to-set-the-home-page

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This could be an issue caused by AdAware or Web Companion from Lavasoft.

You can look for a file named dsengine.js in these locations.

C:\Program Files\Mozilla Firefox\defaults\pref\
C:\Program Files (x86)\Mozilla Firefox\defaults\pref\

You can look for a file named dsengine.cfg in the main Firefox program folder.

C:\Program Files\Mozilla Firefox\
C:\Program Files (x86)\Mozilla Firefox\

Delete the dsengine.js and dsengine.cfg files when present.