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					Originally Posted by skb  There are some browser plugins* (usually for Chrome or Firefox) that read epubs.  
I haven't used them for a while as I now use the viewer in Calibre.
 
* (Or at least they used to). https://www.hongkiat.com/blog/read-e...irefox-chrome/  (I'm pretty sure it was ePubReader that I used to use. | 
	
 I've used the Readium for Chrome add-on and the EpubReader add-on for Firefox.  The newest version of EpubReader has some limitations due to Firefox Quantum using the WebExtensions API which changes how files are handled.  OTOH, since those limitations keep an add-on from having unprotected access to the filesystem so it's hard to argue with them as security improvements.