I'm curious if the HN crowd knows how one maintains such extensions sustainably...
Just by glancing at it, I'd imagine that it's tightly coupled with the markup and styling of Gmail. If Gmail changes anything about its layout, the extension has to change, too. Does this mean that your extension is periodically broken (and you have to be available to fix it after every layout change/tweak) or is there a better way (e.g. some Gmail-specific APIs or some such)?
Just by glancing at it, I'd imagine that it's tightly coupled with the markup and styling of Gmail. If Gmail changes anything about its layout, the extension has to change, too. Does this mean that your extension is periodically broken (and you have to be available to fix it after every layout change/tweak) or is there a better way (e.g. some Gmail-specific APIs or some such)?