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Disable Dictionary Add-On and Tracking Protection

Both You must disable both the Dictionary Add-On and Tracking Protection will cause an error and interrupt testing, unless disabled. To disable the dictionary add-onfor testing:

1. Click the Open Menu at the top-right of the Firefox page

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   , and click Add Ons.

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2. Click Click Add Ons > Extensions. 
3. Find Dictionary Extension, and click Disable. 
4. Refresh Firefox and resume the session.

To disable Tracking Protection:

1. Click the Open Menu at the top-right of the Firefox page, again, and click Preferences (Options for Windows).

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   Click Firefox > Preferences.
2. Click Privacy.
3. Uncheck Request that sites not track you and Use Tracking Protection in Private Windows.
4. Restart Firefox and resume the testing session.