Firefox doesn't regonise it's own update
As shown in the attached screenshot, being on any Mozilla page, or things like google Maps always say I'm not running the latest version. At the moment I am, however, running version 42.0 (which also shows in the screenshot). When checking for updates, Firefox itself says it is up to date. (OS: Windows10
ps. Your 'educated guess' isn't that educated, says i'm running 19.0 on a Windows7.
Выбранное решение
Your User Agent as you can see in More System Details on right of post Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0
https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox
There are some extensions that can modify useragent also.
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Выбранное решение
Your User Agent as you can see in More System Details on right of post Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0
https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox
There are some extensions that can modify useragent also.
Изменено James
Nice! This solved my problem. Thanks