firefox.exe is a program which is probably legit. So, if firefox.exe is on your system, it is probably ok, and will NOT be a cause for concern. Even if your system is virus-free, it is still recommended to use a good antivirus with a good detection rate, in order to defend yourself against potential security problems.
Usually, the default filename and path where the application is stored is
C:\Program Files\Tor Browser\Browser\firefox.exe.
The MD5 fingerprint for this file is afa10a3f4e0fcdc2212feb5fb2f632d4.
This program does NOT operate as a Windows service. This is normally a good sign.
This exe runs as a 32-bit program. It does not exploit the full power of modern computer processors. This is quite normal because the publishers did not upgrade it to use the x64 instruction set.
The description written in the file is Tor Browser.
File version extracted from the file 38.8.0.
Company Mozilla Corporation.
Legal copyright notice ©Firefox and Mozilla Developers; available under the MPL 2 license..
firefox.exe appears to have a visible user interface. This is good because it doesn't operate in some kind of invisible mode. Its activity is clearly shown to the user.
A digital certificate is missing from this program. The authors did not bother to sign it. This is usually bad.
This executable does NOT have an uninstall command set up in registry.