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Why is 64-bit Firefox running from Program Files (x86)?

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I've just found out that a 64-bit version of Firefox has been available for a couple of years now! Why hasn't my version of Firefox hasn't been automatically upgraded to the 64 bit version?

I decided to try manually installing the 64-bit version, so I went to the download page (https://www.mozilla.org/en-US/firefox/all/?q=English%20(US)#product-desktop-release) and specifically downloaded the 64-bit version. But to my surprise, this program wanted to install to Program Files (x86)!

To my further surprise, I checked in the Task Manager, and the version I'm already running has no asterisk next to it, suggesting that it's 64-bit. Yet it's installed in Program Files (x86)!?

According to this Mozilla support page: https://support.mozilla.org/en-US/kb/custom-installation-firefox-on-windows, the 64-bit version of the program is supposed to be installed in Program Files.

This is so confusing. Can anyone help?

I've just found out that a 64-bit version of Firefox has been available for a couple of years now! Why hasn't my version of Firefox hasn't been automatically upgraded to the 64 bit version? I decided to try manually installing the 64-bit version, so I went to the download page (https://www.mozilla.org/en-US/firefox/all/?q=English%20(US)#product-desktop-release) and specifically downloaded the 64-bit version. But to my surprise, this program wanted to install to Program Files (x86)! To my further surprise, I checked in the Task Manager, and the version I'm already running has no asterisk next to it, suggesting that it's 64-bit. Yet it's installed in Program Files (x86)!? According to this Mozilla support page: https://support.mozilla.org/en-US/kb/custom-installation-firefox-on-windows, the 64-bit version of the program is supposed to be installed in Program Files. This is so confusing. Can anyone help?

Chosen solution

When Firefox updated from 32bit to 64 bit, it didn't change the location it was installed to. If you want to change the location, you'll need to uninstall first, then verify the location again.

I'll note, it doesn't matter where the program is installed, if it's 64bit it'll run in 64bit mode

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  • User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:71.0) Gecko/20100101 Firefox/71.0

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Tyler Downer
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1538 solutions 10735 answers

Chosen Solution

When Firefox updated from 32bit to 64 bit, it didn't change the location it was installed to. If you want to change the location, you'll need to uninstall first, then verify the location again.

I'll note, it doesn't matter where the program is installed, if it's 64bit it'll run in 64bit mode

When Firefox updated from 32bit to 64 bit, it didn't change the location it was installed to. If you want to change the location, you'll need to uninstall first, then verify the location again. I'll note, it doesn't matter where the program is installed, if it's 64bit it'll run in 64bit mode
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Question owner

Thank you Tyler, that is helpful. I will leave the program where it is then :)

Thank you Tyler, that is helpful. I will leave the program where it is then :)
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