Tried something new, new request.
Diacritic insensitive search please. Eventually, if possible, insensitive only for searched words without diacritics, so jaune could find jaune and jaûne but jaûne only jaûne.
And. I'm not sure how much this increases memory usage. Swapping between files can occur often looking up footnotes. If there were two views with one having the previous opened file, switching between in the common case of notes would be really quick.
While I'm thinking of notes, if annotations were possible in ePub 3 notes, that'd be amazing.
And found something else. Perhaps a different default color for links like footnotes? The accessibility feature of inversing colors is fairly significant and I think a color that works well with it, rather than switching themes, is a good idea.
With inversed colors, one of the highlight colors is also difficult to distinguish.