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brouser suddently changed to Microsoft bing although firefox is my default. How do I change back to firefox?
Firefox suddenly changed to Microsoft bing. How do I change back to Firefox?
Firefox suddenly changed to Microsoft bing. How do I change back to Firefox?
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Are you talking about the home page? https://support.mozilla.org/en-US/kb/how-to-set-the-home-page
Or the search engine? Type about:preferences#search<enter> in the address bar. You can select any search engine to be your default from here.
You can also remove any engine from here.