Perhaps we should stop calling open-source software "free" due to the stigma that comes with it. It's no longer a selling point, nor should it have been.
There are about 5.5 billion people on the internet. Firefox's "small" market share of ~5% is still about 250 million users.
I'm reasonably sure that a small fraction of those 250 million people are even aware of the concept of "Free Software" or "Open Source", or how it relates to Firefox.
Open does not imply any freedoms. A software source could be openly put in the public but without license, hence you would not be free to use it nor to learn from it.
I'm reasonably sure that a small fraction of those 250 million people are even aware of the concept of "Free Software" or "Open Source", or how it relates to Firefox.