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Using GTK+ 2.x and GTK+ 3 in the same process is not supported . . .
I had been using firefox just fine, until I started to get the error message:
$ ./firefox -safe-mode &  4499
$ (firefox:4499): Gtk-WARNING **: GTK+ module libgail.so cannot be loaded. GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported. close failed in file object destructor: sys.excepthook is missing lost sys.stderr
+ Exit 1 ./firefox -safe-mode $
How should I troubleshoot such error?