Please check browser extensions. There is probably malicious extension installed. Try to disable All of them and check.

The issue was resolved by a suggestion on BleepingComputer.com: Reset Chrome settings to default. You can restore your browser settings in Chrome...

Look for Chrome extensions Clusite extension this was the issue I found when using Chrome and it would switch to Bing. I removed this extension and...

I removed the annoying Bing search in Windows 8.1 by going to Tools>Manage add-ons>Search providers then deleted the Bing that was listed. When I r...

I was aghast when all my "google" searches came up on bing, and came to this very thread to find help. It was when I went to my add-ons manager tha...

I found the following information on this web page: If you wish to remove the Bing page and it seems not to work by changing the settings (step 2)...

Look in the Control Panel called "Programs and Features" (or if you are viewing the Control Panel by Categories, click "Uninstall a program" near t...

Go to Tool > Internet options. In the Generals window look for Tabs and open it. Then look for When a new tab is opened and change it to your firs...

I have searched for ages to find a solution and this is the only thing that worked. I found it on the Mozilla support page listed below. The soluti...

In my case, the above-mentioned change using "about:config" was not sufficient. After I did that, I was still seeing Bing whenever I opened a new tab.

I Stopped Bing from being the default search engine on Firefox 58.0.2 by; Go to the about:config page, Accept the warning, Find the setting "bro...

Open the 3 dot drop down menu.On the right corner of Chrome screen. Select settings in it. Go to default search engines and delete bing or which ev...