User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.75 Safari/537.36 Steps to reproduce: I have a table with a HEX-string in some cell like this - 11-00-00-00-00-00-00-02. In firefox the string is not breaking to next line but it is if there is not zeros in it. Here is plunker for better understanding - http://plnkr.co/edit/N6e7MGnYndtQmLYSkjBb?p=preview. Works fine in other browsers. Expected results: The string shoud break to other line.

Also interesting: 11-00-00-00-0B-00-0G-02 wraps to 11-00-00-00-0B 00-0G-02 but not 11-00-00-00-0B-00-00-02

Compare: data:text/html,<div style="width:1px">abcdefg-hijklmnop data:text/html,<div style="width:1px">abcdefg9-hijklmnop data:text/html,<div style="width:1px">abcdefg-9hijklmnop data:text/html,<div style="width:1px">abcdefg9-9hijklmnop Firefox doesn't allow line-break at a hyphen if the hyphen is between two digits, but it does allow it between letters, or between a letter and a digit (in either order). This appears to be the intended behavior[1] but perhaps isn't always the best option. [1] http://searchfox.org/mozilla-central/rev/f6dc0e40b51a37c34e1683865395e72e7fca592c/intl/lwbrk/nsJISx4051LineBreaker.cpp#799-800