It's not crazy, it's Intent Filters [0], IMHO the Android killer feature as an open platform. As an Android user I love the ability to select my default app in order to open an image, share an image, share a text/link and, of course, open a Play Store app record. It's the Android way and Firefox is breaking it.
As a recent iPhone switcher, yes, I love intents. It's great to be able to set what I open mailto: links in, etc.
Not sure I understand the connection here though, could you explain? What intent is Firefox breaking, and why is it OK that Chrome can go to play.google.com (in the browser, it doesn't bounce me to the Play Store app) while Firefox is blocked?
Apparently if you open a link to the Play Store, Firefox just opens it normally and lets you reopen it in the app if that's what you want, rather than immediately dumping you into the app and randomly breaking stuff like tab support in the process.
[0] http://developer.android.com/guide/components/intents-filter...