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When I click to make Firefox my browser, a window comes up for me to choose what to use to open a long list of programs for which I have no clue.

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I think about 15 programs are on that list, including calculator asking me to name the program to use to open it. I don't know what to use to open any program.

I think about 15 programs are on that list, including calculator asking me to name the program to use to open it. I don't know what to use to open any program.

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If you are talking about making Firefox your default browser, see this: https://support.mozilla.org/en-US/kb/make-firefox-your-default-browser