How do I determine what version of Thunderbird is running on my Ubuntu 16.4.1?

How do I determine what version of Thunderbird is running on my Ubuntu 16.4.1? I just built an old machine (PC) in installed the latest Ubuntu, found the Thunderbird email app, and saw if I wanted it in sync with my gmail, it had to be a certain version. Now I'm signed up and just need to find if I have a/the compatible correct version. I'm going to keep looking, just thought I'd get a quick answer.

2 Answers

Simple. Fire up a terminal with CTRL+ALT+T and run the following command:

thunderbird --version

The output I got was:

(process:3718): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed Thunderbird 38.4.0

So you can see my system has Thunderbird version 38.4.0.

Alternatively, a GUI way is to open Thunderbird and go Help > About Thunderbird. I get this window, which shows the version:

You can also find the version number in the prefs.js file, open that in a text editor and look for the line containing "extensions.lastAppVersion"