The current version of the Chrome Tab Snooze Extension (version 2.0.17 at this writing) was released in June of 2019, and even though it is over two years old, appears to have worked in all of that time.
However, a recent update to Google Chrome – perhaps to Chromium, as it appears to also affect Microsoft Edge – seems to mean that the extension has gone a bit off the rails.
Unfortunately, though the developer web site seems to be online, and even asks for contributions to a Pro version, there does not seem to be any response. Luckily, it’s not all that difficult to make it usable again, though it does take a bit of work.