these maybe:

• https://developer.mozilla.org/en-US/d.../log

and the API reference:

• https://getfirebug.com/wiki/index.php/Console_API
• https://getfirebug.com/wiki/index.php/Console_API

Actually i want the browser console security messages which are in tools menu in which it is in web developers option....i want security messages from browser console and store that message

here is the browser console and the notifications which are given in red are security messages...i want to retrieve those messages

You can copy those messages to the clipboard via the right-click context menu either via Select All (Ctrl+A) or by selecting only some text and use Copy. You may first have to select some text with the mouse to make Ctrl+A work.

i want to do it in a generalized way not by clicking and all

You may need to experiment with the Console API if you would like to do this dynamically.