On 01/01/2015 07:46 PM, Michele Calgaro wrote:
> Not sure what the problem is and honestly haven't spent time on it, but
> just googling for "firefox url black bar" brings up several posts you can
> look into.
> Hope this helps :-)

Thanks, it did help.  I had googled it before without finding a solution,
but found it when trying again.

The solution is very simple:  In about:config, set gfx.xrender.enabled to false.

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