Since updating FirefoxPortable to 19.0 on my D: drive Win 7 32 bit PC it won't start but shows an XULRunner dialog box with message:
Error: Platform version '18.0.2 is not compatible with
minVersion >= 19.0
maxVersion
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Firefox won't start, gets a XULRunner error
February 23, 2013 - 6:35am
#1
Firefox won't start, gets a XULRunner error
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The best bet is to reinstall a new copy right over the old one. An in-place upgrade to the same version. Just download a new copy and install it to the same place.
Sometimes, the impossible can become possible, if you're awesome!
That fixed it