# ExternalInterface and FireFox issue

**URL:** <https://forum.kirupa.com/t/externalinterface-and-firefox-issue/299740>\
**Category:** flash\
**Created:** [November 10, 2009, 1:10pm UTC](https://forum.kirupa.com/t/externalinterface-and-firefox-issue/299740 "2009-11-10T13:10:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![andalusite](https://avatars.discourse-cdn.com/v4/letter/a/8e8cbc/32.png) [@andalusite](https://forum.kirupa.com/u/andalusite)\
**Post date:** [November 10, 2009, 1:10pm UTC](https://forum.kirupa.com/t/externalinterface-and-firefox-issue/299740/1 "2009-11-10T13:10:20Z")

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I have placed two SWFs on an HTML page using SWFObject.  
I originally tried using LocalConnection to pass vars between the two, but found it to be unreliable. So I now use ExternalInterface, passing vars via some JavaScript in the HTML page.  
In IE and Safari under Windows all works well.  
However, in FireFox the ExternalInterface only works 50% of the time.  
On first load of the page it will work. Press F5 to refresh and it fails. Refresh again and it will work.  
Admittedly, I dont expect users to refresh the page in this manner. But does anyone have an idea what is happening?