Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Is my firefox 64 or 32 bit

  • 1 reply
  • 36 have this problem
  • 10 views
  • Last reply by James

more options

Build identifier: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0 I would like to know

Build identifier: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0 I would like to know

Chosen solution

WOW64 means it is a 32-bit application on 64-bit Windows. It is the 32bit emulator for x64 systems.

Mozilla does not have Win64 release builds of Firefox yet and not likely for a while still. They do have 64-bit Release builds for Mac OSX (combined 32/64) and for Linux.

Read this answer in context 👍 24

All Replies (1)

more options

Chosen Solution

WOW64 means it is a 32-bit application on 64-bit Windows. It is the 32bit emulator for x64 systems.

Mozilla does not have Win64 release builds of Firefox yet and not likely for a while still. They do have 64-bit Release builds for Mac OSX (combined 32/64) and for Linux.

Modified by James