That's usually an operating system choice, although some applications do pick it up. HipChat isn't one, as far as I know, it relies on the OS setting for opening urls. I'd guess that you've used or installed something that has changed the OS default for opening links.
Try changing your global browser preference setting to something else, then back to your preferred browser settings.
I had this problem recently, first with links in HipChat opening in Safari while Chrome was my default browser, then after the most recent HIpchat update, with links (to non-video urls, like github pull requests) trying to open in "Hipchat Video.app", of all things. Re-setting my global browser preference fixed it.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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