It Get Our Data And Sents To The Hacker Please Dont Install It

Hello I Am Using Google Chrome By Default,
But Today I Downloaded Opera And I Want To Make It My Default Browser But When I Search Something By Google It And Login To My Googlr Account On Other Tab I'll No Longer Logged In Always I dont Know Why It Is Happening Can Someone Fix My Problem...... And How Can I Remove My Otther Account Named Taha