Almost no sane person and security aware person uses Internet Explorer still. However still in huge American companies it is heavily used. If you install Firefox or Google Chrome and by mistake you change default browser to one of them then it is worthy revert back default browser to Internet Explorer.
Here is how to do it;
Open Internet Explorer and navigate to:
Tools -> Interent Options -> Programs -> click on (Make Default)
Done
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Tags: aware person, change default browser, google, internet explorer, mistake, sane person