Strange 404 error in Firefox

Can anyone explain the error shown below? 404 - file not found for file: forms/en_US/Organisation_Person/tabcontents/organisation_edit_473425.mxf I'm testing an application locally and I get this error now and then; the application is still running and when I close the screen and re-open it, the error doesn't occur anymore...
1 answers

I encountered the error myself several times. Not sure what the causing issue issue is, but emptying cache, redeploy, or in the worst case removing the 'deployment' directory always solved the issue.