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Recently saved MHTML files won't open, while earlier saved ones will open.


Recently saved MHTML files won't open in Firefox 14, but earlier saved ones will open. The only change I made recently to Firefox was to disable Java because hackers had found a way to use it to access PCs.

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.5 r502
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • RealJukebox Netscape Plugin
  • RealPlayer(tm) LiveConnect-Enabled Plug-In
  • RealPlayer Download Plugin
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.3
  • WordCaptureX component for single click dictionary
  • 1.7.0059.1
  • np-mswmp
  • Windows Multimedia Services DRM Store Plug-In


  • User Agent: Mozilla/5.0 (Windows NT 5.1; rv:14.0) Gecko/20100101 Firefox/14.0.1

More Information

  • Top 10 Contributor
2353 solutions 20839 answers

I assume you are using an add-on to create and decode the MHTML files? You might check with the author of the add-on as to whether it requires Java or a newer version of Firefox in order to work properly.

Question owner

I found the problem: Java has to be enabled when saving to MHTML format.