ask.com search bar pops up all the time
How do I make it go away in browser?
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It sounds like an unauthorized extension; I'm assuming that you are having this in Safari browser. Go to Safari Preferences > Extensions tab: --you can disable any extensions you don't want by selecting it, and un-checkmarking the box. You can also delete it completely by clicking on the Uninstall button on the righthand side window.
Here's a couple of support articles for more information:
https://support.apple.com/guide/safari/get-extensions-sfri32508/mac
[Link Edited by Moderator]