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Firefox will not open.

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  • Last reply by cmrexx

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I've used Firefox sporadically for a couple of years. Last week it would not open. I refreshed, then uninstalled and reinstalled and it still won't open. What do I do now?

I've used Firefox sporadically for a couple of years. Last week it would not open. I refreshed, then uninstalled and reinstalled and it still won't open. What do I do now?

Chosen solution

Did you recently uninstall an application that was using Visual C+ runtime components?

You can check for issues caused by a corrupted or incomplete Visual C++ installation that is missing runtime components (Redistributable Packages) required by Firefox, especially VCRUNTIME140_1.dll.

See "Visual Studio 2015, 2017, 2019, and 2022":

You may also have to install the Visual Studio 2013 Redistributable Package. You need to reboot the computer.


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Chosen Solution

Did you recently uninstall an application that was using Visual C+ runtime components?

You can check for issues caused by a corrupted or incomplete Visual C++ installation that is missing runtime components (Redistributable Packages) required by Firefox, especially VCRUNTIME140_1.dll.

See "Visual Studio 2015, 2017, 2019, and 2022":

You may also have to install the Visual Studio 2013 Redistributable Package. You need to reboot the computer.


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I downloaded .x64 and .x86, rebooted and it is working.

Thanks