Stable income: Somewhat stable

Building browser plugins can offer a moderately stable income source for most people who try it. From online sources and personal experience, it's observed that individuals can earn consistently, although there may be fluctuations in income at times. While it provides a decent baseline income, it may not always be entirely predictable. Costs range from $100 to $500 for setup, and individuals can start earning within 2 weeks. I'd rate it a 3 out of 5 because while it offers a reliable income stream for many, there might be periods of uncertainty that make it less stable than a traditional job.