I cannot open more than one browser in firefox, I did a reinstall and now cannot open any browsers
I went to open firefox, and I got one window. It would not open additional windows. It would open a ctrl t tab,. but no additional windows. I usually have 8 windows running at once, it will not work at all now
User Agent
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/531.9 (KHTML, like Gecko) Version/4.0.3 Safari/531.9.1
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You can use "Disable all add-ons" on the Safe mode start window to disable all extensions. You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")