I would strongly recommend against it, from a security and data protection perspective due: "No warranties or guarantees of security or updates or even stability! Note that Iceraven Browser includes some unstable code written by Mozilla, with our own added modifications on top, all shipped with the stable version of GeckoView engine. Hence, the browser may contain bugs introduced upstream. Binaries are currently built automatically by our Github release automation. These binaries are signed with a debug key. When we finally publish this somewhere official like F-droid, we will sign the apks with a proper key suitable for public release. Due to the current way we create the releases and sign them, you may not want to rely on such "alpha" quality software as your primary web browser, as it will have bugs. So, use this browser only if you are comfortable with these limitations/potential risks."

Source: https://github.com/fork-maintainers/iceraven-browser