My browser is NOT out of date

[assenoff]

Hello.
I'm running Win7 64bit with Firefox 19.0. When I log in my wordpress site admin panel an orange box pops up saying I should update my browser.
The operating system and the browser are completely updated.

[nacin]

Hi, can you visit ​http://api.wordpress.org/core/browse-happy/1.0/test.php and paste the results here?

[assenoff]

Screenshot of my current Mozilla Firefox About page (version 19.0)

[assenoff]

Hello again. Sorry for the delayed answer. I'm pasting the results as required:

Mozilla/5.0 (Windows NT 6.1; rv:10.0) Gecko/20100101 Firefox/10.0

platform = Windows
name = Firefox
version = 10.0
update_url = http://www.firefox.com/
img_src = http://s.wordpress.org/images/browsers/firefox.png
img_src_ssl = https://wordpress.org/images/browsers/firefox.png
current_version = 16
upgrade = 1
insecure = 0

I've also added an attachment with a screenshot of my current Mozilla Firefox About page (version 19.0).

[nacin]

Do you have web development add-on or other extension modifying your user agent string?

That string pretty clearly corresponds to Firefox 10.

​https://developer.mozilla.org/en-US/docs/Gecko_user_agent_string_reference

[johnbillion]

Closing as worksforme. OP's user agent must have been affected by an add-on.

Firefox 23 (latest version) clearly contains "Firefox 23.0" in its user agent and does not trigger the browser update message in core.