I just got a new macbook pro, firefox is being very glitchy, please help?

I just got a new Macbook pro yesterday.
I took it home and downloaded the newest Firefox (my go-to browser for years), and I'm having some pretty substantial issues.
First, I tried streaming a movie on Netflix last night, and I'm getting a really obscure error message that provides me a list of steps. I follow the steps and nothing happens. I tried watching on Chrome and Safari and they both work.
Next, and this is the one that confuses me most, is when I pull up a video on youtube and take it to fullscreen, The bottom toolbar that gives pause and play options, shows how far along in the video you are, etc, is granulated and slightly obscured. Somehow abstracted, I guess, when it should obviously be crystal clear. I've literally never seen anything like this before, and once again, it's only happening on Firefox. I'm pretty frustrated at this point, can anyone help me?
Before you ask, I've run all my software updates and everything is completely good to go, so that's not the solution.
Thanks for reading, hopefully I can get some feedback soon.

Is it a beep or a chime (or tone)?
When it's powered on, the Mac goes through a POST (Power On Self Test), in which it briefly tests crucial components. A (more or less) musical chime or tone indicates that the POST was successful. If POST fails, what you hear depends on the Mac and the error -- a beep, or several beeps, or even a chord. These articles will give you more info
<http://support.apple.com/kb/HT1547>
<http://support.apple.com/kb/HT2341>
The startup chime may be a problem if you start your MBP in an inconvenient location. You can mute it by holding down the mute key (F10) until the Apple logo appears.

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