Control of search engine seems invalid or corrupt

In parameters, the function of search engine to customize does not appear to offer any option of withdrawal or the command option. Actually when I search, the auto-usages Yahoo browser. What could happen?

Click on an item in the settings should allow you to remove or as a default value. https://support.Mozilla.org/en-us/KB/manage-my-default-search-engines-Firefox-Android

Tags: Firefox App

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    (1) open the Control Panel, uninstall a program. After the loading of the list, click on the column heading "installed on" to group infections, I mean additions by date. This can help the undisclosed items bundle smoker who snuck out with some software, you have agreed to install. Beware of everything that you don't recognize / remember, since malware often uses sounding names important or innocent to discourage you remove. Out as much garbage as possible here.

    (2) open Firefox page modules using either:

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    Try Firefox Safe mode to see how it works there.

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