Use IndexedDB instead of using localstorage

[Tetrax-10]

What kind of feature request is this?

Feature improvements – suggestions for something that can make a current feature a bit better.

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Is your feature request related to a problem? Please describe.

localstorage has a size limit of 5MB so when I set image URLs as base64 to avoid remote connections and load fast, the storage gets full just for few urls.

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Describe the solution you'd like

Using IndexedDB can over come this problem and it can manage large amounts of data very efficient.

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Describe alternatives you've considered

None

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Additional context

I have implemented IndexedDB on my userscript to overcome this storage issue. You can reffer it: Letterboxd Custom Images