Hello catsnorchids, we're sorry to hear that Firefox is crashing when you open it. Please do the following to give us crash IDs that will help us understand more about the crash. #Click the '''Finder''' icon in the dock. Your home folder will be selected. In the right side of the window, click the Library folder to open it. Then open the "Application Support" folder, the "Firefox" folder, the "Crash Reports" folder and finally the "submitted" folder. #Open the 5 most recent 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.