title: How to prevent CSS declaration dropped errors cross browser?
body: <p>Hi I would like to know how to easily prevent dropped errors from appearing from debugging software such as webdeveloper plugin in Firefox. I get errors such as:</p>
  
  <p>Warning: Error in parsing value for 'filter'.  Declaration dropped.</p>
  
  <p>Warning: Error in parsing value for 'font'.  Declaration dropped.</p>
  
  <p>I understand I get these errors because Firefox does not support these CSS properties, but how do I drop them before hand so Firefox does not attempt to read them in the first place? I know I can create a separate style sheet for every browser but that is a inconvenience. Is there a simple solution?</p>