@JimmXinu: The browser cartel has decided to deprecate Application Cache with Service Workers even though Service Workers only work with https, requiring which is completely unsuitable for a private server like calibre.
So if the cartel actually has its way and manages to remove Application Cache, you will only be able to browse your calibre server offline if you setup HTTPS.
Not much I can do about that.
As for your error, it looks like your browser does not have a working IndexedDB implementation. Maybe because you are browsing in private mode?
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