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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!

被采纳的解决方案

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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选择的解决方案

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)