Asking, because it took a minute to figure this out and nothing came up on Google. Answer coming up.

I downloaded a Firefox (nightly) build from mozilla.org for testing. Running it presented an error:

$ firefox
XPCOMGlueLoad error for file /home/parallels/firefox-32/libmozgtk.so:
libgtk-3.so.0: cannot open shared object file: No such file or directory
Couldn't load XPCOM.

The file does exist on my Ubuntu 14.04 LTS:

$ locate libgtk-3.so.0

Turns out I needed to download the x86_64 version from the Mozilla site, not the 32-bit version.

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  • 1
    Thanks for saving my time. I had the same problem when downgrade from firefox version 48 to 47 in ubuntu 14.04. – zhihong Aug 18 '16 at 10:01

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