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Ever since Firefox updated, it won't open any of my EPUB files anymore. What is wrong?

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Every time I click on my ebooks in the .epub format, I get a dialog box that asks me which program I want to use to open the file, or if I wish to save it. When I Firefox to open the file, Firefox simply opens another tab with another dialog box and the process simply repeats and repeats and repeats. Doesn't Firefox have the EPUB reader anymore?

Every time I click on my ebooks in the .epub format, I get a dialog box that asks me which program I want to use to open the file, or if I wish to save it. When I Firefox to open the file, Firefox simply opens another tab with another dialog box and the process simply repeats and repeats and repeats. Doesn't Firefox have the EPUB reader anymore?

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There is an add on that might help with this: https://addons.mozilla.org/en-us/fire.../epubreader/