Today, the Codeforces Tools 0.0.6 has been released. This update contains a new feature & bug fixes.
New: Added an option page
When you see your submissions, if you only logged on to codeforces.ru or the like for Codeforces, you need to set it on the new setting page. It may take a little time, but it's not hard to do. I think this is not enough, so I'll have a time to improve it in order to add the auto detect.
Download & Installation
You can get Codeforces Tools from following links,
And one, you can see the source code on GitHub: https://github.com/sh19910711/codeforces-tools
If you want to know more about the extension, please see also this article: http://www.codeforces.com/blog/entry/5560.
OK, if you had found any bugs or problems, please report it to me :)