If it includes Win64 and/or 圆4 it is a 64-bit version. If you have not modified the user agent of the browser, you may load about:support in the browser's address bar and check the user agent string. You have a couple of options to find out if you are running a 32-bit or 64-bit version of Firefox. Mozilla revealed recently that more than 30% of Firefox installations are on 32-bit versions of Windows. 64-bit versions on the other hand only on 64-bit Windows versions.

The main Firefox Stable download page on the Mozilla website offers 32-bit and 64-bit versions of the browser with 64-bit the default nowadays.ģ2-bit versions of Firefox run on 32-bit and 64-bit versions of Windows. Mozilla released a 64-bit version of the Firefox web browser for Windows last year and started to promote it more actively in recent time.

The situation has changed significantly in recent time. That was the main reason why only 1.7% ran a 64-bit version of Firefox at the time. Firefox users who wanted to download and use a 64-bit version of the browser on Windows needed to search for it actively.

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