Please follow the steps below to provide us crash IDs to help us learn more about your crash. The crash report is several pages of data. We need the report numbers to see the whole report. 1. Enter about:crashes in the address bar and press Enter. A list of Submitted/Unsubmitted Crash Reports will appear. 2. Copy the 5 most recent Submitted Report IDs that start with bp- and then go back to your forum question and paste those IDs into the "Post a Reply" box. Note: If a recent Report ID does not start with bp- click on it to submit the report. Note: If you can't open Firefox because it crashes at startup even in Safe Mode, use these alternative instructions to locate Report IDs: 1. Press Windows Key + R on the keyboard. Enter "%APPDATA%\Mozilla\Firefox\Crash Reports\submitted" (including the quotation marks) and click OK. 2. In the resulting folder, there will be a text file for each crash report you have submitted. Using the View menu, arrange them by date to find out which is the newest file; and double-click on it to open it. Crash Reporter https://support.mozilla.org/en-US/kb/mozillacrashreporter