If you wish to determine the version of Firefox installed on an OS X from a command line interface (CLI), you can open a Terminal window and use the command shown below:
$ /Applications/Firefox.app/Contents/MacOS/firefox -v Mozilla Firefox 45.8.0 $
You can also find the information in the
Info.plist file found at
/Applications/Firefox.app/Contents/Info.plist. The version number
will be on the line following the "key" line for CFBundleGetInfoString
and also after the "key" line for CFBundleShortVersionString
.
<key>CFBundleGetInfoString</key>
<string>Firefox 45.8.0</string>
<key>CFBundleShortVersionString</key>
<string>45.8.0</string>
[ More Info ]
