I absolutely hate it. It only takes one or two PDFs that crash or freeze Firefox to install a completely separate viewer that is much better. It depends on how

I absolutely hate it. It only takes one or two PDFs that crash or freeze Firefox to install a completely separate viewer that is much better. It depends on how often it happens to you, but I probably had three crash or freeze type issues before I switched. I did have dozens of documents with invisible text (wrong styling in pdf.js) that messed it up for me, though.