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Is there any kind of pdf the built in pdf-viewer doesn't support?

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  • Last reply by smo

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I run a website that needs to be able to show pdf-files smoothly in the built-in pdf viewer, it works fine with Chrome and Explorer but not with Firefox. It's able to show most of the pdf's (takes a little time to load) but some of the pdf-files load forever.

I've tried, and it works like a charm for me.

But is there any way that I can fix this on my end, so that my customers can view the pdf-files without doing anything themselves?

Thanks beforehand.

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hello, the firefox html5 pdf viewer is still somewhat experimental and under very active development - you could try if the same error is occurring in the current development version, which you can download as an addon from

in case it has the the same rendering problems, you could then file a bug report at (a github account is necessary for it though) - please also provide a sample document where the error is apparent!

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The best you can do for your customers and for Mozilla is to provide, if you are allowed too of course - the questionable PDF files and file them together with a new bug in Bugzilla > Firefox > PDF viewer