My library installed Firefox on our workstations about a year ago. The IT person told us that we would love it, that it offered "more depth" than Internet Explorer.
We weren't convinced right away. In fact, some of us didn't try it for about two weeks. I was one of those people. I wasn't quite ready for that type of change.
I started slowly, using it about once a day. I would look over the shoulders of my colleagues as they played with it. We thought it was quite amusing when we tried to print something and it wouldn't print in Firefox, but would print in Internet Explorer.
About a month later, I decided that the best way for me to really learn "the depth" of this new browser was to download it on my personal laptop. Afterwards I really started to play with it. I learned how to bookmark my favorite sites, customize the toolbar, and I discovered add-ons.
I think I have only downloaded 3 or 4 add-ons. My favorite is the No Squint. My vision isn't what it used to be and this helps me enlarge the font to my liking.
If I recall correctly, unlike Internet Explorer, where you can increase the print at the bottom right hand corner, in Firefox I had to go to the Firefox homepage and query the question about increasing the font. Once I did this, I got the answer and the name of the add-on I needed.
Another benefit of No Squint is that I receive messages automatically when it is time to update my version. That's wonderful!!
Other reasons I like Firefox are the ability to move around in more than one website at a time. Having this option via the tabs is awesome.
I haven't explored all of what Firefox does, but I really enjoy what I have learned so far.