I know it's semantics, but I think it's important in this case to mention that the entire article is about the open-source Chromium browser, not the proprietary Google Chrome one.
Really cool project in any case, seems like working at Pikkit must've been a lot of fun ! Thanks OP for sharing.
If you're forwarder is running but the browser crashed, it will still appear as available on the Redis side. While if you're making the browser setting a key with expiration itself, if it crashes, it will stop appearing on redis side.
Those are the kind of stuff you get modifying the source, and that will be hard to do with dual process type of setup.