I also sometimes use Masterpdfeditor, but that's when I need a pdf editor on my system - it does indeed need qt. I am also a longtime user of Foxit Reader. However, my question would be: what is the advantage of Foxit reader (or any other "pdf reador" over using Firefox/Mozilla provide PDF.js, which in my tests works very well indeed (is opensource and continually being developed)? Different if you want or need a pdf editor, but that would not surely be expected in base iso. Since base iso comes with Firefox, it thus comes with inbuilt pdf reader, which I suspect many people don't realise can be used with locally-stored pdfs too (just needs activated and, optionally, filebrowser associations set as I described).
Main app most people use is probably their browser (so it is usually already running) - might as well benefit from the additional html5 js support/bloat in them - it's already there so no disadvantage to use anyway.
William
Sorry, wasn't long out of my bed so kept making typing errors and having to fix/repost!!!
EDIT: PDF.js is inbuilt into FIrefox, which works fine/out-of-the-box in default XenialDog32, but if you were using Palemoon it seems you need to add plugin:
https://addons.palemoon.org/addon/moon-pdf-viewer/
Personally, I've always had trouble with Palemoon (after using it for a while). I can't remember the details (maybe fixed?) but it used to start using a lot of RAM over time I think. Nobody else seemed to have the problem or at least didn't notice or didn't report it. I prefer Firefox original.
EDIT: Yes, just read in Palemoon release notes than pdf.js code was removed in Nov 2016 from main browser (ver 27), because their pdf.js code wasn't being maintained. That isn't the case for official pdf.js from mozilla, however, it is constantly being updated/maintained - last pdf.js github entry just 3 days ago and I haven't come across a pdf yet that it can't display correctly.
Of course, I can't say if Firefox will always come with inbuilt pdf reader, but it does just now, and it works. Users can install external pdf readers any time they like...