We're sorry to hear that your Firefox seems to be crashing when you open it. Please perform the following steps to give us a crash report ID that helps us find out more about the cause of the crash. #On the keyboard, press [Windows] [[Image:Windows key]] + [R]. This should bring up a Run window that contains a text field. #In that text field, type '''%APPDATA%''' and press Enter. An explorer window should open. #From that explorer window, double-click on the ''Mozilla'' folder, then double-click on ''Firefox'' and then on ''Crash reports''. Double-click on ''submitted''. #Now, you should see a list of files that contain reports. Go to ''View'' > ''Arrange Icons by'' > ''Modified'' to get the most recent files at the top of the window. #Open the most recent 5 files with a text editor and copy the IDs. #Paste each ID with '''bp-''' into the reply window on the forums. Thanks in advance! You can find more information and troubleshooting steps in the [[Firefox crashes]] article.

question continues here: https://support.mozilla.org/questions/1151418