Related, since it's also a Mozilla project, I was shocked to see rust-lang/rust's issue count. I consider Rust to be one of the best maintained open source repositories. Their DevOps is legendary. And yet, the repo has over _4,600_ open issues.
That issue count isn't for lack of fixing things. The Rust project is tirelessly proactive about handling issues, merging pull requests, mentoring committers, etc. I've personally contributed to Rust before and had a splendid and expedient time doing so. In other words, I wouldn't say Rust has 4,600 bugs so much as it has 4,600 coals in the fire.
That's insane. I have a really hard time wrapping my head around the herculean task of triaging and working an issue pool of that size. It really gives me a lot of respect for the team members and volunteers.
I thought it was worth sharing as others may not be aware of just how crazy open source project management can be. It certainly puts tools like BugBug's importance into context.