about browsers in DivX's System Requirements page;
But if I remember rightly, DivX player need to be installed in the OS and not in a browser. After it is installed there may be a browser add-on, but specifically I had to get into my browser's Options > Programs, (or Applications), tab and specify DivX for certain video file types.
That said, I see from Pale Moon's web site that it doesn't have all the features of Firefox so perhaps this is one feature that is missing.
I'm trying out the 64 bit version of the Pale Moon browser and can't seem to get it to recognize the Divx web player, i've uninstalled and re-installed Divx several times to no avail. Am I doing something wrong?