It is also the only browser with significant market share that exists primarily to serve its users, not its vendor. As someone who feels strongly about preserving the open nature of the internet, I find it important that a strong independent browser balances out the corporate browsers (most notably Chrome/Chromium, Safari, and Edge).
Mostly just want to see what else is out there.
For you specifically or generally speaking?
Generally (excluding if it is censored and/or dangerous to use it in some country) since the more people use it the more noise there is and thus the better the anonymity and privacy for everyone else.
