Why does Firefox no longer scale its size correctly with my new Macbook Pro?

hey folks, experiencing a weird issue and I'm not sure how to resolve it.
I've been using Firefox as my default browser for about a year, love it. I had been using a late 2011 Macbook Pro, sometimes just as a laptop, sometimes attached to a 4 year old external monitor. No issues.
A few weeks ago I switched to a new Macbook Pro with the retina display. When I use the laptop with my external monitor, the sizing of the app is all wrong. It's like super zoomed out. Web pages and text like the menus, bookmarks, etc..are so small I can't read them. When I use the laptop just as a laptop, sometimes Firefox looks ok, and sometimes it's showing this rendering problem.
I tried launching Firefox in safe mode without my plethora of add ons, no change in behavior.
I'm running what I think is the latest version of Firefox for the Mac, v 34.0.5. As an example, I could not read the version number, it was too tiny. I could see where it was so copied it and pasted it in here. And, I'm running the latest version of Yosemite, 10.10.1.
I'd love to get Firefox working again, does anyone have any suggestions. Right now I've had to go back to Safari as my default browser, which is ok but I do prefer Firefox.
One additional note: I'm not seeing this behavior with any other app. Everything else looks appropriately sized. The issue is only with Firefox. I appreciate any ideas any of y'all might have, thank you.

One more thing: even though Firefox said it was up to date, it appeared the latest version was 35.0. So, I downloaded and installed that, thinking maybe a fresh install would remedy this problem. No joy, still looks the same.
Bummer.
I'm attaching a screenshot of how the browser looks, for reference.

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