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Archive for July 7, 2015

Firefox 39.0 showing blank white windows in OS X VMs

July 7, 2015 15 comments

I do a lot of my application testing in VMs, so when Firefox 39.0 came out, it went into my test environment and I built a new VM to check it out.


Update – 8-13-2015: This issue has been resolved in Firefox 40.x and later.


Firefox 39.0 looked like this when I launched it in my test VM.

Screen Shot 2015 07 06 at 4 03 11 PM

As part of my testing workflow, I also installed Firefox 39.0 onto a couple of actual Macs.

Firefox 39.0 looked like this when I launched it on those machines.

Screen Shot 2015 07 06 at 3 10 57 PM

As you can see, two very different results were discovered as part of my testing. After a few rounds of “It’s broken in the VM, retest, it’s still broken, retest on my laptop, no problem, repeat,” I finally tracked down a Mozilla bug report that indicated that the issue was not specific to my environment and gave me the potential scope of the issue. For more information, see below the jump.

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