Why can't Firefox still not show a pdf properly from within the browser and do we need insufficient and not working add-ons?

I never succeeded to show a pdf properly in the Firefox browser.
There is an add-on, but the add-on itself tells you already in most cases that you should download the pdf because it can't show the pdf properly. I can't understand why that is! It makes my live much more complicated, since we have an application running that constantly should be able to show pdf's from within the browser.

The add-on you are talking about is pdf.js. pdf.js does it best to show you what the pdf's it is given are, but pdf.js is not 100% compatible with all elements that can be put inside a pdf. Another problem pdf.js faces is that many pdf's generated with proprietary software either do not conform to the pdf spec or use proprieatary elements that only pdf readers that the company has designed or partnered with can interpret. I promise you Mozilla doesn't want your life to be any more complicated than it is but sometimes it is simply not possible for pdf.js to read a document when the manufacturer of the program that generated the pdf doesn't play by the rules.

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