I use either my iPad using kindle app, iBooks app, or the Japanese website to read my digital books or I use Calibre on Windows laptop. But I rarely read on a screen if I can help it (I have an eye condition that means I should do less screen time but I use screens for work
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My understanding is it depends on how the manga is uploaded to where you got it from. Some have clickable text meaning you can use the dictionary of your device/ browser/ app if it supports Japanese text but others are just images of the manga page or panels which can make it more difficult to be able to select the text.
I have used a screenshot then selected the text to put into a dictionary or translation app before but that can add additional time and take away from immersive reading.
Awesome haul
puts my recent order to shame 



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