<ui:style> defines a CssResource, so class names will be obfuscated; that 
may be the cause of your problem.
Try using @external to mark the class so it's not obfuscated.
See 
http://www.gwtproject.org/doc/latest/DevGuideClientBundle.html#External_and_legacy_scopes;
 
and in case you're using the new GSS see the “External style classes” 
section at http://www.gwtproject.org/doc/latest/DevGuideGssVsCss.html

On Sunday, December 13, 2015 at 3:49:48 PM UTC+1, [email protected] wrote:
>
> Actually if I add any styling with <ui:style> notation FF stops to 
> generate the output. I have blank pages. Can it be connected somehow to 
> development mode I use?  I run "mvn gwt:run" and open default browser from 
> the GWT application. 
>  
> On Sunday, December 13, 2015 at 12:11:53 PM UTC+2, [email protected] wrote:
>>
>> Hello all,
>>
>>          Doing tutorials I have found that Ripple effect with UI style 
>> provided in example makes elements invisible.  I have tested with FireFox 
>> 26 and 42 -- all the same.  At Google chrome everything works as expected. 
>> Why this style blanks the page in FireFox?
>>
>>     <ui:style>
>>     paper-icon-item {
>>         position: relative;
>>         overflow: hidden;
>>     }
>>     </ui:style>
>>
>>
>>

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