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Certain Windows users of Firefox and Labmatrix have reported issues where they are unable to log into Labmatrix; these issues have been tracked down to a bug either in the Flash plugin or in Firefox's use of a special isolation mode when running that plugin. You can follow the steps below to fix the issue.

Note that the interface for making advanced preference changes can definitely allow you to break Firefox completely! It's important that you follow the directions below very closely.

  1. Start Firefox.
  2. Type about:config into the address bar, and then press Enter.
  3. If you receive the "This might void your warranty!" warning, click the "I'll be careful, I promise!" button.
  4. Type (or cut and paste) npswf32.dll into the "Filter" text field at the top of the page.
  5. This should filter the list in the page down to a single entry: "dom.ipc.plugins.enabled.npswf32.dll", and the value listed for that entry should be "true".
  6. Double-click that entry line, and verify that when you do so, the value changes to "false".
  7. Click on the "Tools" menu, choose the "Add-ons" entry, and then in the window that comes up, click on the purple "Plugins" icon (looks like a small Lego brick).
  8. In the list of plugins, scroll down to the "Shockwave Flash" entry, and click on it; this should expose a button at the bottom right that reads "Enable".
  9. Click on the "Enable" button.
  10. Close the Plugins window, and then quit Firefox.
  11. Restart Firefox, and verify that you are now able to log into the Labmatrix website (https://labmatrix.nci.nih.gov/labmatrix/).