Invalid State Error - FireFox

Some mLevel Users are experiencing the error below when using the WebGL version of the platform:


There are two solutions that are available, the end user can use the HTML5 version of mLevel at or use the work around that was identified by the mLevel Development Team. The work around is outlined below:

Step 1: Open up your Firefox browser and then go into the settings menu, located in the top right corner:


Step 2: Click on "Preferences" in the pop-out menu, then select "Privacy" in the menu on the left hand side

Step 3: Change the "History" setting from "Remember History" to "Never Remember History" and restart the browser.



If you have any further questions or concerns, please contact the mLevel Support Team at

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