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Multiple copies of Firefox’s Session Restore may also cause Not Responding error. You have to delete duplicated Session Restore files. Go to Firefox tab > Help > Troubleshooting Information > under Application Basics section, click Show Folder > exit Firefox > delete sessionstore.js and some of its duplicated file from the folder.
Dial the Mozilla Firefox technical support number 1-800-299-0962, talk about the issues to the technicians that you have. Promise is that your issues will be resolved in the first call.
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