Hi

You can check which version of Firefox you are using by selecting Help in the menu bar, followed by About Firefox (at the bottom of the drop down list). Alternatively, type about:support in the address bar and press enter.

I hope this helps, but if not, please come back here and we can look into an alternative solution for you,

Excellent advice   !
There's even a third way to do it:
3-bar menu > Options > Advanced > Updates > Show updates history

Hi, also, type about: in the address bar and press enter, you get the beautiful firefox icon also :-)

thanks