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How can I tell which version of Firefox is installed on my computer?

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I received 2 notices that said an update installation had failed. I tried to manually download the update, and I don't know whether it actually "took" or not. So I need to know the number of the latest update, and then how to tell what numbered version is on my computer. (Windows 7) Thanks!

I received 2 notices that said an update installation had failed. I tried to manually download the update, and I don't know whether it actually "took" or not. So I need to know the number of the latest update, and then how to tell what numbered version is on my computer. (Windows 7) Thanks!

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Did you post this question using Firefox? The Firefox used to post this question identified itself this way:

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0

In other words, it's Firefox 53.0, 32-bit version, running on Windows 7, 64-bit version. (It's normal for Windows users to run 32-bit Firefox, but you can switch if you want to. See: How to switch from 32-bit to 64-bit Firefox)

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Solution choisie

Did you post this question using Firefox? The Firefox used to post this question identified itself this way:

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0

In other words, it's Firefox 53.0, 32-bit version, running on Windows 7, 64-bit version. (It's normal for Windows users to run 32-bit Firefox, but you can switch if you want to. See: How to switch from 32-bit to 64-bit Firefox)