My Open Source Tale Part 1: Baby You're a Firefox

My adventure this week beings not with the current class or assignment that I am working on but actually with another class that I am taking this term. I am currently taking 4 classes this semester and one of them happens to be a web development class which is kind of fun but is also a bit of a buttkicker...
Anyway,  in my attempt to complete an assignment and not completely bomb the class I'd downloaded Google Chrome as an alternate browser to use in addition to trusted and true Safari. The reason I even did that to begin with was because I had written this "spectacular" code but it would not render when I tried to view it in Safari. In my flawed thinking I figured that it MUST be a problem with Safari...yeah, no...it was my faulty syntax. Anyway, if two is good, three must be better so for this class I am reviewing my experience with Mozilla Firefox, which I have downloaded as well.
First, I didn't know that Firefox was even considered "open source".  In the past when I think of open source it had a kind of negative connotation to it. As if because the software is "free" it must be cheap or bad and we all know that this line of thinking is false.
After getting the software downloaded and ready to go , it pretty much functions as any other browser would. I clicked on it and it was a bit slow to start but it took me to the homepage where I was given instructions on how I could make that my homepage, get a new email account, and basic web
browsing instructions....there was nothing there that really knocked my socks off or would make me abandon my Chrome or Safari... I guess I'm just a creature of habit. 
I did find it a little strange that the folks at Firefox use Yahoo as it's search engine...I didn't think people actually still did that....not trying to act like a search engine snob but...I'm a slave for the Google machine I suppose as it is no longer a name but a verb in the English language...but what do I know...I should probably Google that.
So, that's the first of three open source software reviews. Thanks for reading and if you can offer me a little knowledge on the subject or if there's something I failed to see let me know in the comments.
P.S here is the beginnings of a test webpage I developed rendering in Firefox: