Here I use Opera. But there are some sites that I prefer to open in Mozilla Firefox or Google Chrome. Here comes the link to the event in my google-calendar in my email client. If you click on it, the default browser will open, i.e. Opera. And I'm on Google I get Google Chrome. So you have to copy the link, launch Google Chrome with your hands, paste it in there and open the page. Inconvenient.
Began to look for something that would help solve the problem. Not found.
In a creative rush
MT Browser Switcher . This small program will allow you to assign different browsers to different sites by default.
MT Browser Switcher acts as a default browser for the system. After a request to open any URL (for example, after clicking on a link in a text editor or in your favorite RSS reader),
MT Browser Switcher analyzes this URL and selects the desired browser in accordance with the rules you specify. If no rules fit the URL, then the link simply opens in the default browser.
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Scheme of work

Who cares, the details here:
http://mito-team.com/ru/projects/mt-browser-switcherFor feedback, bug reports or suggestions I will be grateful :)