I have Firefox 38.2.0 and it tells me that it is the most recent version but online there is version 40 + and it won't let me install it.

My OS is Windows 10. I have Firefox 38.2.0 and it tells me that it is the most recent version. However, I got emails telling me to upgrade to the latest version which seems to be in the 40s. When I go to the https://www.mozilla.org/en-US/firefox/new/ website, it tells me
"Looks like you are using an older version of Firefox."

So I click on upgrade and it loads a file "stub". I close in Firefox, go to the folder where the file is located and run it. At the end of the process, he told me that Firefox still works and I have to close it for the new version to load. Then I go to the Task Manager, and he told me that no request to don't run! I went through this process three times without any positive result.

What to do?

I'll answer your question, but I suggest not changing your version of Firefox until find us out if having to do any with your plant, discussed here: https://support.mozilla.org/questions/1078897

At some point, there are two different versions of Firefox:

  • Public release of the standard/large: currently Firefox 40.0.2
  • Extended support release (ESR): currently Firefox 38.2.0

The version of ESR is intended for companies who need maximum stability for their users. New features usually are not added for at least six months, although security patches are issued approximately every six weeks.

You want to switch to the standard version? If so, this is how I suggest to do:

Clean reinstall it

We use this name, but it isn't about deleting your settings, this is to ensure that the program, files are clean (not incompatible, corrupt or exotic code files). As described below, this process does not disrupt your existing settings. Don't uninstall NOT Firefox, that does not need.

(A) download a fresh Installer for Firefox 40.0.2 of https://www.mozilla.org/firefox/all/ in an ideal location. (Scroll down your preferred language).

(B) the release of Firefox (if any).

(C) to rename the program folder, either:

(Windows 64-bit folder names)

C:\Program Files (x86)\Mozilla Firefox

TO

C:\Program Files (x86)\FxESR

(Windows 32-bit folder names)

C:\Program Files\Mozilla Firefox

TO

C:\Program Files\FxESR

(D) run the installer downloaded to (A). It should automatically connect to your existing settings.

Note: Some plugins can only exist in the old folder. If it is missing something essential, present in these files:

  • \FxESR\Plugins
  • \FxESR\browser\plugins

Tags: Firefox

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