Change tab colour of an opened PDF

Hello all,

I usually have quite some PDFs open in Sumatra and I cycle throught them a lot. It happens me quite some times that I close down the wrong PDF. Is it possible to give a distinct or special colour or marking to the tab of an PDF that is open? At this moment the shades of blue confuse me more than it helps.


Multiple issues on GitHub (some closed, other duplicates still open):

Also related - general theming issues:

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