Firefox Health Report - understand your browser performance

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The Firefox Health Report provides you with information about your browser’s performance and stability over time. Mozilla uses this data to provide you with meaningful comparisons and tips. We also aggregate the data shared by everyone to make Firefox better for you.

Note: This applies to the latest Firefox beta version which can be downloaded from

How to view your Firefox Health Report

  • At the top of the Firefox window, click the Firefox button, go over to the Help sub-menu and select Firefox Health Report.At the top of the Firefox window, click the Help menu and select Firefox Health Report.On the menu bar, click the Help menu and select Firefox Health Report.
  • Click the menu button New Fx Menu , click help Help-29 and select Firefox Health Report.
Note: If you have just installed Firefox, the information in the Health Report may not be accurate. It typically takes 14 days of browser use to see any trends.

How to turn data sharing on or off

Data sharing is on by default but you can always turn it on or off from the top of any Firefox Health Report page. Click on the Data Sharing button on the upper right corner of the page.

You can also turn sharing on or off with these steps:

  1. Click the menu button New Fx Menu and choose Options.Preferences.
  2. Select the Advanced panel.
  3. Select the Data Choices tab.
  4. Check or uncheck the box next to Enable Firefox Health Report.
  5. Close the about:preferences page. Any changes you've made will automatically be saved.

When you turn sharing off, Firefox will stop sending information about your browser to Mozilla servers. Firefox will send a request to the Mozilla servers to delete the previously submitted information. This request is processed immediately after being successfully received. If the browser does not receive a response that the request was succesfully processed (due to lack of internet connectivity for instance), the browser will continue to send the delete request periodically until it is successfully received.

If the user does not turn sharing off, but the browser is no longer sending data (due to being uninstalled or no longer being used), the previously sent data from that browser will be deleted after 180 days.

Even if you choose not to share data with Mozilla, you will still be able to see information about your browser when you go to the Firefox Health Report page, and you can view the comparison data from other browsers that are sharing their data. The comparison data will not be based on the data from your browser since it was not shared with Mozilla.

What is the Startup Time graph?

The Startup Time by Day graph shows how long it took your browser to start on any given day. The default view (Average), shows the median startup time for that day. Clicking on the “All” toggle shows all the startup times for the day. You can see up to 90 days of data on the graph.

How do I view the raw data collected?

You can view a text file of the data that Firefox Health Report collects by clicking on the Raw Data tab. This display shows the exact data that is being sent to Mozilla (if sharing is on).

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